Finding the Fourth Proportional to 118.20, 162.15 and 109.02

Step by Step Solution

1. Step 1: Write the proportion equation
   118.20 : 162.15 = 109.02 : x
2. Step 2: Convert to fraction form
   118.20/162.15 = 109.02/x
3. Step 3: Cross multiply
   118.20x = 162.15 × 109.02
4. Step 4: Simplify right side
   118.20x = 17,677.59
5. Step 5: Solve for x
   x = 17,677.59/118.20
6. Step 6: Final answer
   x = 149.56