Finding the Fourth Proportional to 91,081.92, 136,513.88 and 64,387.55

Step by Step Solution

1. Step 1: Write the proportion equation
   91,081.92 : 136,513.88 = 64,387.55 : x
2. Step 2: Convert to fraction form
   91,081.92/136,513.88 = 64,387.55/x
3. Step 3: Cross multiply
   91,081.92x = 136,513.88 × 64,387.55
4. Step 4: Simplify right side
   91,081.92x = 8,789,793,269.69
5. Step 5: Solve for x
   x = 8,789,793,269.69/91,081.92
6. Step 6: Final answer
   x = 96,504.26