(a) 78921092

78,921,092 = seventy eight million nine hundred twenty one thousand ninty two

(b) 7452283

7,452,283 = seven million four hundred fifty two thousand two hundred eighty three

(c) 99985102

99,985,102 = ninety nine million nine hundred eighty five thousand one hundred two

(d) 48049831

48,049,831 = forty eight million forty nine thousand eight hundred thirty one.