Finding the Fourth Proportional to 90.90, 136.23 and 42.82

Step by Step Solution

1. Step 1: Write the proportion equation
   90.90 : 136.23 = 42.82 : x
2. Step 2: Convert to fraction form
   90.90/136.23 = 42.82/x
3. Step 3: Cross multiply
   90.90x = 136.23 × 42.82
4. Step 4: Simplify right side
   90.90x = 5,833.37
5. Step 5: Solve for x
   x = 5,833.37/90.90
6. Step 6: Final answer
   x = 64.17