Finding the Fourth Proportional to 90.38, 124.82 and 61.22

Step by Step Solution

1. Step 1: Write the proportion equation
   90.38 : 124.82 = 61.22 : x
2. Step 2: Convert to fraction form
   90.38/124.82 = 61.22/x
3. Step 3: Cross multiply
   90.38x = 124.82 × 61.22
4. Step 4: Simplify right side
   90.38x = 7,640.78
5. Step 5: Solve for x
   x = 7,640.78/90.38
6. Step 6: Final answer
   x = 84.55