Finding the Fourth Proportional to 31,399.56, 47,139.32 and 20,352.47

Step by Step Solution

1. Step 1: Write the proportion equation
   31,399.56 : 47,139.32 = 20,352.47 : x
2. Step 2: Convert to fraction form
   31,399.56/47,139.32 = 20,352.47/x
3. Step 3: Cross multiply
   31,399.56x = 47,139.32 × 20,352.47
4. Step 4: Simplify right side
   31,399.56x = 959,401,694.56
5. Step 5: Solve for x
   x = 959,401,694.56/31,399.56
6. Step 6: Final answer
   x = 30,554.62