Finding the Fourth Proportional to 99,792,147.70, 149,688,221.55 and 56,793,978.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99,792,147.70 : 149,688,221.55 = 56,793,978.10 : x
2. Step 2: Convert to fraction form
   99,792,147.70/149,688,221.55 = 56,793,978.10/x
3. Step 3: Cross multiply
   99,792,147.70x = 149,688,221.55 × 56,793,978.10
4. Step 4: Simplify right side
   99,792,147.70x = 8,501,389,576,538,649
5. Step 5: Solve for x
   x = 8,501,389,576,538,649/99,792,147.70
6. Step 6: Final answer
   x = 85,190,967.15