Finding the Fourth Proportional to 312,517,002.66, 468,729,872.78 and 91,128,851.61

Step by Step Solution

1. Step 1: Write the proportion equation
   312,517,002.66 : 468,729,872.78 = 91,128,851.61 : x
2. Step 2: Convert to fraction form
   312,517,002.66/468,729,872.78 = 91,128,851.61/x
3. Step 3: Cross multiply
   312,517,002.66x = 468,729,872.78 × 91,128,851.61
4. Step 4: Simplify right side
   312,517,002.66x = 42,714,815,021,287,152
5. Step 5: Solve for x
   x = 42,714,815,021,287,152/312,517,002.66
6. Step 6: Final answer
   x = 136,679,971.51