Finding the Fourth Proportional to 90.52, 124.72 and 83.80

Step by Step Solution

1. Step 1: Write the proportion equation
   90.52 : 124.72 = 83.80 : x
2. Step 2: Convert to fraction form
   90.52/124.72 = 83.80/x
3. Step 3: Cross multiply
   90.52x = 124.72 × 83.80
4. Step 4: Simplify right side
   90.52x = 10,451.54
5. Step 5: Solve for x
   x = 10,451.54/90.52
6. Step 6: Final answer
   x = 115.46