Finding the Fourth Proportional to 90.17, 124.43 and 59.15

Step by Step Solution

1. Step 1: Write the proportion equation
   90.17 : 124.43 = 59.15 : x
2. Step 2: Convert to fraction form
   90.17/124.43 = 59.15/x
3. Step 3: Cross multiply
   90.17x = 124.43 × 59.15
4. Step 4: Simplify right side
   90.17x = 7,359.56
5. Step 5: Solve for x
   x = 7,359.56/90.17
6. Step 6: Final answer
   x = 81.62