Finding the Fourth Proportional to 139.50, 209.31 and 67.32

Step by Step Solution

1. Step 1: Write the proportion equation
   139.50 : 209.31 = 67.32 : x
2. Step 2: Convert to fraction form
   139.50/209.31 = 67.32/x
3. Step 3: Cross multiply
   139.50x = 209.31 × 67.32
4. Step 4: Simplify right side
   139.50x = 14,090.75
5. Step 5: Solve for x
   x = 14,090.75/139.50
6. Step 6: Final answer
   x = 101.01