Finding the Fourth Proportional to 90.25, 124.55 and 61.15

Step by Step Solution

1. Step 1: Write the proportion equation
   90.25 : 124.55 = 61.15 : x
2. Step 2: Convert to fraction form
   90.25/124.55 = 61.15/x
3. Step 3: Cross multiply
   90.25x = 124.55 × 61.15
4. Step 4: Simplify right side
   90.25x = 7,616.23
5. Step 5: Solve for x
   x = 7,616.23/90.25
6. Step 6: Final answer
   x = 84.39