Finding the Fourth Proportional to 90.32, 124.61 and 85.61

Step by Step Solution

1. Step 1: Write the proportion equation
   90.32 : 124.61 = 85.61 : x
2. Step 2: Convert to fraction form
   90.32/124.61 = 85.61/x
3. Step 3: Cross multiply
   90.32x = 124.61 × 85.61
4. Step 4: Simplify right side
   90.32x = 10,667.75
5. Step 5: Solve for x
   x = 10,667.75/90.32
6. Step 6: Final answer
   x = 118.12