Finding the Fourth Proportional to 71.47, 107.06 and 42.50

Step by Step Solution

1. Step 1: Write the proportion equation
   71.47 : 107.06 = 42.50 : x
2. Step 2: Convert to fraction form
   71.47/107.06 = 42.50/x
3. Step 3: Cross multiply
   71.47x = 107.06 × 42.50
4. Step 4: Simplify right side
   71.47x = 4,549.74
5. Step 5: Solve for x
   x = 4,549.74/71.47
6. Step 6: Final answer
   x = 63.66