Finding the Fourth Proportional to 90.62, 135.98 and 42.51

Step by Step Solution

1. Step 1: Write the proportion equation
   90.62 : 135.98 = 42.51 : x
2. Step 2: Convert to fraction form
   90.62/135.98 = 42.51/x
3. Step 3: Cross multiply
   90.62x = 135.98 × 42.51
4. Step 4: Simplify right side
   90.62x = 5,780.30
5. Step 5: Solve for x
   x = 5,780.30/90.62
6. Step 6: Final answer
   x = 63.79