Finding the Fourth Proportional to 116.72, 175.05 and 71.09

Step by Step Solution

1. Step 1: Write the proportion equation
   116.72 : 175.05 = 71.09 : x
2. Step 2: Convert to fraction form
   116.72/175.05 = 71.09/x
3. Step 3: Cross multiply
   116.72x = 175.05 × 71.09
4. Step 4: Simplify right side
   116.72x = 12,443.43
5. Step 5: Solve for x
   x = 12,443.43/116.72
6. Step 6: Final answer
   x = 106.61