Finding the Fourth Proportional to 90.15, 124.32 and 59.05

Step by Step Solution

1. Step 1: Write the proportion equation
   90.15 : 124.32 = 59.05 : x
2. Step 2: Convert to fraction form
   90.15/124.32 = 59.05/x
3. Step 3: Cross multiply
   90.15x = 124.32 × 59.05
4. Step 4: Simplify right side
   90.15x = 7,341.10
5. Step 5: Solve for x
   x = 7,341.10/90.15
6. Step 6: Final answer
   x = 81.43