Finding the Fourth Proportional to 92.52, 137.82 and 90.42

Step by Step Solution

1. Step 1: Write the proportion equation
   92.52 : 137.82 = 90.42 : x
2. Step 2: Convert to fraction form
   92.52/137.82 = 90.42/x
3. Step 3: Cross multiply
   92.52x = 137.82 × 90.42
4. Step 4: Simplify right side
   92.52x = 12,461.68
5. Step 5: Solve for x
   x = 12,461.68/92.52
6. Step 6: Final answer
   x = 134.69