Finding the Fourth Proportional to 139.37, 209.04 and 43.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139.37 : 209.04 = 43.18 : x
2. Step 2: Convert to fraction form
   139.37/209.04 = 43.18/x
3. Step 3: Cross multiply
   139.37x = 209.04 × 43.18
4. Step 4: Simplify right side
   139.37x = 9,025.82
5. Step 5: Solve for x
   x = 9,025.82/139.37
6. Step 6: Final answer
   x = 64.76