Finding the Fourth Proportional to 84,382.72, 116,436.72 and 71,687.20

Step by Step Solution

1. Step 1: Write the proportion equation
   84,382.72 : 116,436.72 = 71,687.20 : x
2. Step 2: Convert to fraction form
   84,382.72/116,436.72 = 71,687.20/x
3. Step 3: Cross multiply
   84,382.72x = 116,436.72 × 71,687.20
4. Step 4: Simplify right side
   84,382.72x = 8,347,022,433.98
5. Step 5: Solve for x
   x = 8,347,022,433.98/84,382.72
6. Step 6: Final answer
   x = 98,918.62