Finding the Fourth Proportional to 90.62, 124.98 and 78.83

Step by Step Solution

1. Step 1: Write the proportion equation
   90.62 : 124.98 = 78.83 : x
2. Step 2: Convert to fraction form
   90.62/124.98 = 78.83/x
3. Step 3: Cross multiply
   90.62x = 124.98 × 78.83
4. Step 4: Simplify right side
   90.62x = 9,851.55
5. Step 5: Solve for x
   x = 9,851.55/90.62
6. Step 6: Final answer
   x = 108.72