Finding the Fourth Proportional to 139.32, 209.16 and 67.23

Step by Step Solution

1. Step 1: Write the proportion equation
   139.32 : 209.16 = 67.23 : x
2. Step 2: Convert to fraction form
   139.32/209.16 = 67.23/x
3. Step 3: Cross multiply
   139.32x = 209.16 × 67.23
4. Step 4: Simplify right side
   139.32x = 14,061.83
5. Step 5: Solve for x
   x = 14,061.83/139.32
6. Step 6: Final answer
   x = 100.93