Finding the Fourth Proportional to 71.06, 106.59 and 42.17

Step by Step Solution

1. Step 1: Write the proportion equation
   71.06 : 106.59 = 42.17 : x
2. Step 2: Convert to fraction form
   71.06/106.59 = 42.17/x
3. Step 3: Cross multiply
   71.06x = 106.59 × 42.17
4. Step 4: Simplify right side
   71.06x = 4,494.37
5. Step 5: Solve for x
   x = 4,494.37/71.06
6. Step 6: Final answer
   x = 63.25