Finding the Fourth Proportional to 128,891,142.72, 177,884,922.86 and 72,385,175.02

Step by Step Solution

1. Step 1: Write the proportion equation
   128,891,142.72 : 177,884,922.86 = 72,385,175.02 : x
2. Step 2: Convert to fraction form
   128,891,142.72/177,884,922.86 = 72,385,175.02/x
3. Step 3: Cross multiply
   128,891,142.72x = 177,884,922.86 × 72,385,175.02
4. Step 4: Simplify right side
   128,891,142.72x = 12,876,231,274,278,372
5. Step 5: Solve for x
   x = 12,876,231,274,278,372/128,891,142.72
6. Step 6: Final answer
   x = 99,900,047.46