Finding the Fourth Proportional to 139.52, 209.31 and 43.34

Step by Step Solution

1. Step 1: Write the proportion equation
   139.52 : 209.31 = 43.34 : x
2. Step 2: Convert to fraction form
   139.52/209.31 = 43.34/x
3. Step 3: Cross multiply
   139.52x = 209.31 × 43.34
4. Step 4: Simplify right side
   139.52x = 9,071.50
5. Step 5: Solve for x
   x = 9,071.50/139.52
6. Step 6: Final answer
   x = 65.02