Finding the Fourth Proportional to 42.01, 62.91 and 34.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.01 : 62.91 = 34.31 : x
2. Step 2: Convert to fraction form
   42.01/62.91 = 34.31/x
3. Step 3: Cross multiply
   42.01x = 62.91 × 34.31
4. Step 4: Simplify right side
   42.01x = 2,158.60
5. Step 5: Solve for x
   x = 2,158.60/42.01
6. Step 6: Final answer
   x = 51.39