Finding the Fourth Proportional to 42.47, 63.45 and 42.11

Step by Step Solution

1. Step 1: Write the proportion equation
   42.47 : 63.45 = 42.11 : x
2. Step 2: Convert to fraction form
   42.47/63.45 = 42.11/x
3. Step 3: Cross multiply
   42.47x = 63.45 × 42.11
4. Step 4: Simplify right side
   42.47x = 2,671.88
5. Step 5: Solve for x
   x = 2,671.88/42.47
6. Step 6: Final answer
   x = 62.91