Finding the Fourth Proportional to 42.53, 63.31 and 42.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42.53 : 63.31 = 42.30 : x
2. Step 2: Convert to fraction form
   42.53/63.31 = 42.30/x
3. Step 3: Cross multiply
   42.53x = 63.31 × 42.30
4. Step 4: Simplify right side
   42.53x = 2,678.28
5. Step 5: Solve for x
   x = 2,678.28/42.53
6. Step 6: Final answer
   x = 62.97