Finding the Fourth Proportional to 117.72, 162.72 and 106.92

Step by Step Solution

1. Step 1: Write the proportion equation
   117.72 : 162.72 = 106.92 : x
2. Step 2: Convert to fraction form
   117.72/162.72 = 106.92/x
3. Step 3: Cross multiply
   117.72x = 162.72 × 106.92
4. Step 4: Simplify right side
   117.72x = 17,398.02
5. Step 5: Solve for x
   x = 17,398.02/117.72
6. Step 6: Final answer
   x = 147.79