Finding the Fourth Proportional to 90.91, 136.42 and 39.55

Step by Step Solution

1. Step 1: Write the proportion equation
   90.91 : 136.42 = 39.55 : x
2. Step 2: Convert to fraction form
   90.91/136.42 = 39.55/x
3. Step 3: Cross multiply
   90.91x = 136.42 × 39.55
4. Step 4: Simplify right side
   90.91x = 5,395.34
5. Step 5: Solve for x
   x = 5,395.34/90.91
6. Step 6: Final answer
   x = 59.35