Finding the Fourth Proportional to 71.50, 106.49 and 68.43

Step by Step Solution

1. Step 1: Write the proportion equation
   71.50 : 106.49 = 68.43 : x
2. Step 2: Convert to fraction form
   71.50/106.49 = 68.43/x
3. Step 3: Cross multiply
   71.50x = 106.49 × 68.43
4. Step 4: Simplify right side
   71.50x = 7,286.89
5. Step 5: Solve for x
   x = 7,286.89/71.50
6. Step 6: Final answer
   x = 101.91