Finding the Fourth Proportional to 99,723,761.42, 149,812,646.72 and 72,142,751.93

Step by Step Solution

1. Step 1: Write the proportion equation
   99,723,761.42 : 149,812,646.72 = 72,142,751.93 : x
2. Step 2: Convert to fraction form
   99,723,761.42/149,812,646.72 = 72,142,751.93/x
3. Step 3: Cross multiply
   99,723,761.42x = 149,812,646.72 × 72,142,751.93
4. Step 4: Simplify right side
   99,723,761.42x = 10,807,896,607,187,910
5. Step 5: Solve for x
   x = 10,807,896,607,187,910/99,723,761.42
6. Step 6: Final answer
   x = 108,378,348.89