Finding the Fourth Proportional to 99,807.97, 137,779.91 and 65,836.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99,807.97 : 137,779.91 = 65,836.57 : x
2. Step 2: Convert to fraction form
   99,807.97/137,779.91 = 65,836.57/x
3. Step 3: Cross multiply
   99,807.97x = 137,779.91 × 65,836.57
4. Step 4: Simplify right side
   99,807.97x = 9,070,956,689.31
5. Step 5: Solve for x
   x = 9,070,956,689.31/99,807.97
6. Step 6: Final answer
   x = 90,884.09