Finding the Fourth Proportional to 91,859,443.20, 137,647,447.20 and 79,671,729.60

Step by Step Solution

1. Step 1: Write the proportion equation
   91,859,443.20 : 137,647,447.20 = 79,671,729.60 : x
2. Step 2: Convert to fraction form
   91,859,443.20/137,647,447.20 = 79,671,729.60/x
3. Step 3: Cross multiply
   91,859,443.20x = 137,647,447.20 × 79,671,729.60
4. Step 4: Simplify right side
   91,859,443.20x = 10,966,610,193,448,676
5. Step 5: Solve for x
   x = 10,966,610,193,448,676/91,859,443.20
6. Step 6: Final answer
   x = 119,384,679.59