Finding the Fourth Proportional to 91,580.18, 126,086.91 and 71,411.18

Step by Step Solution

1. Step 1: Write the proportion equation
   91,580.18 : 126,086.91 = 71,411.18 : x
2. Step 2: Convert to fraction form
   91,580.18/126,086.91 = 71,411.18/x
3. Step 3: Cross multiply
   91,580.18x = 126,086.91 × 71,411.18
4. Step 4: Simplify right side
   91,580.18x = 9,004,015,025.65
5. Step 5: Solve for x
   x = 9,004,015,025.65/91,580.18
6. Step 6: Final answer
   x = 98,318.38