Finding the Fourth Proportional to 139,711.20, 209,564.74 and 34,530.16

Step by Step Solution

1. Step 1: Write the proportion equation
   139,711.20 : 209,564.74 = 34,530.16 : x
2. Step 2: Convert to fraction form
   139,711.20/209,564.74 = 34,530.16/x
3. Step 3: Cross multiply
   139,711.20x = 209,564.74 × 34,530.16
4. Step 4: Simplify right side
   139,711.20x = 7,236,304,002.56
5. Step 5: Solve for x
   x = 7,236,304,002.56/139,711.20
6. Step 6: Final answer
   x = 51,794.73