Finding the Fourth Proportional to 109.30, 162.71 and 108.70

Step by Step Solution

1. Step 1: Write the proportion equation
   109.30 : 162.71 = 108.70 : x
2. Step 2: Convert to fraction form
   109.30/162.71 = 108.70/x
3. Step 3: Cross multiply
   109.30x = 162.71 × 108.70
4. Step 4: Simplify right side
   109.30x = 17,686.58
5. Step 5: Solve for x
   x = 17,686.58/109.30
6. Step 6: Final answer
   x = 161.82