Finding the Fourth Proportional to 116.72, 174.86 and 71.16

Step by Step Solution

1. Step 1: Write the proportion equation
   116.72 : 174.86 = 71.16 : x
2. Step 2: Convert to fraction form
   116.72/174.86 = 71.16/x
3. Step 3: Cross multiply
   116.72x = 174.86 × 71.16
4. Step 4: Simplify right side
   116.72x = 12,443.28
5. Step 5: Solve for x
   x = 12,443.28/116.72
6. Step 6: Final answer
   x = 106.60