Finding the Fourth Proportional to 91.71, 126.27 and 83.61

Step by Step Solution

1. Step 1: Write the proportion equation
   91.71 : 126.27 = 83.61 : x
2. Step 2: Convert to fraction form
   91.71/126.27 = 83.61/x
3. Step 3: Cross multiply
   91.71x = 126.27 × 83.61
4. Step 4: Simplify right side
   91.71x = 10,557.43
5. Step 5: Solve for x
   x = 10,557.43/91.71
6. Step 6: Final answer
   x = 115.12