Finding the Fourth Proportional to 90.02, 134.82 and 74.72

Step by Step Solution

1. Step 1: Write the proportion equation
   90.02 : 134.82 = 74.72 : x
2. Step 2: Convert to fraction form
   90.02/134.82 = 74.72/x
3. Step 3: Cross multiply
   90.02x = 134.82 × 74.72
4. Step 4: Simplify right side
   90.02x = 10,073.75
5. Step 5: Solve for x
   x = 10,073.75/90.02
6. Step 6: Final answer
   x = 111.91