Finding the Fourth Proportional to 42.54, 63.35 and 42.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42.54 : 63.35 = 42.30 : x
2. Step 2: Convert to fraction form
   42.54/63.35 = 42.30/x
3. Step 3: Cross multiply
   42.54x = 63.35 × 42.30
4. Step 4: Simplify right side
   42.54x = 2,679.49
5. Step 5: Solve for x
   x = 2,679.49/42.54
6. Step 6: Final answer
   x = 62.99