Finding the Fourth Proportional to 42.55, 63.38 and 42.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42.55 : 63.38 = 42.07 : x
2. Step 2: Convert to fraction form
   42.55/63.38 = 42.07/x
3. Step 3: Cross multiply
   42.55x = 63.38 × 42.07
4. Step 4: Simplify right side
   42.55x = 2,666.40
5. Step 5: Solve for x
   x = 2,666.40/42.55
6. Step 6: Final answer
   x = 62.67