Finding the Fourth Proportional to 99,859.14, 137,772.42 and 65,884.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,859.14 : 137,772.42 = 65,884.50 : x
2. Step 2: Convert to fraction form
   99,859.14/137,772.42 = 65,884.50/x
3. Step 3: Cross multiply
   99,859.14x = 137,772.42 × 65,884.50
4. Step 4: Simplify right side
   99,859.14x = 9,077,067,005.49
5. Step 5: Solve for x
   x = 9,077,067,005.49/99,859.14
6. Step 6: Final answer
   x = 90,898.71