Finding the Fourth Proportional to 90.18, 124.42 and 76.33

Step by Step Solution

1. Step 1: Write the proportion equation
   90.18 : 124.42 = 76.33 : x
2. Step 2: Convert to fraction form
   90.18/124.42 = 76.33/x
3. Step 3: Cross multiply
   90.18x = 124.42 × 76.33
4. Step 4: Simplify right side
   90.18x = 9,496.98
5. Step 5: Solve for x
   x = 9,496.98/90.18
6. Step 6: Final answer
   x = 105.31