Finding the Fourth Proportional to 71.06, 106.43 and 42.50

Step by Step Solution

1. Step 1: Write the proportion equation
   71.06 : 106.43 = 42.50 : x
2. Step 2: Convert to fraction form
   71.06/106.43 = 42.50/x
3. Step 3: Cross multiply
   71.06x = 106.43 × 42.50
4. Step 4: Simplify right side
   71.06x = 4,523.28
5. Step 5: Solve for x
   x = 4,523.28/71.06
6. Step 6: Final answer
   x = 63.65