Finding the Fourth Proportional to 128,862,612.72, 177,830,434.56 and 70,915,860.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,862,612.72 : 177,830,434.56 = 70,915,860.72 : x
2. Step 2: Convert to fraction form
   128,862,612.72/177,830,434.56 = 70,915,860.72/x
3. Step 3: Cross multiply
   128,862,612.72x = 177,830,434.56 × 70,915,860.72
4. Step 4: Simplify right side
   128,862,612.72x = 12,610,998,329,034,034
5. Step 5: Solve for x
   x = 12,610,998,329,034,034/128,862,612.72
6. Step 6: Final answer
   x = 97,863,903.76