Finding the Fourth Proportional to 162.88, 224.71 and 100.71

Step by Step Solution

1. Step 1: Write the proportion equation
   162.88 : 224.71 = 100.71 : x
2. Step 2: Convert to fraction form
   162.88/224.71 = 100.71/x
3. Step 3: Cross multiply
   162.88x = 224.71 × 100.71
4. Step 4: Simplify right side
   162.88x = 22,630.29
5. Step 5: Solve for x
   x = 22,630.29/162.88
6. Step 6: Final answer
   x = 138.94