Finding the Fourth Proportional to 117.72, 162.42 and 74.10

Step by Step Solution

1. Step 1: Write the proportion equation
   117.72 : 162.42 = 74.10 : x
2. Step 2: Convert to fraction form
   117.72/162.42 = 74.10/x
3. Step 3: Cross multiply
   117.72x = 162.42 × 74.10
4. Step 4: Simplify right side
   117.72x = 12,035.32
5. Step 5: Solve for x
   x = 12,035.32/117.72
6. Step 6: Final answer
   x = 102.24