Finding the Fourth Proportional to 139.30, 209.24 and 134.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139.30 : 209.24 = 134.69 : x
2. Step 2: Convert to fraction form
   139.30/209.24 = 134.69/x
3. Step 3: Cross multiply
   139.30x = 209.24 × 134.69
4. Step 4: Simplify right side
   139.30x = 28,182.54
5. Step 5: Solve for x
   x = 28,182.54/139.30
6. Step 6: Final answer
   x = 202.32