Finding the Fourth Proportional to 71.25, 106.70 and 42.37

Step by Step Solution

1. Step 1: Write the proportion equation
   71.25 : 106.70 = 42.37 : x
2. Step 2: Convert to fraction form
   71.25/106.70 = 42.37/x
3. Step 3: Cross multiply
   71.25x = 106.70 × 42.37
4. Step 4: Simplify right side
   71.25x = 4,520.40
5. Step 5: Solve for x
   x = 4,520.40/71.25
6. Step 6: Final answer
   x = 63.45