Finding the Fourth Proportional to 94.10, 141.18 and 90.18

Step by Step Solution

1. Step 1: Write the proportion equation
   94.10 : 141.18 = 90.18 : x
2. Step 2: Convert to fraction form
   94.10/141.18 = 90.18/x
3. Step 3: Cross multiply
   94.10x = 141.18 × 90.18
4. Step 4: Simplify right side
   94.10x = 12,731.61
5. Step 5: Solve for x
   x = 12,731.61/94.10
6. Step 6: Final answer
   x = 135.30