Finding the Fourth Proportional to 31,401.56, 47,142.32 and 20,354.47

Step by Step Solution

1. Step 1: Write the proportion equation
   31,401.56 : 47,142.32 = 20,354.47 : x
2. Step 2: Convert to fraction form
   31,401.56/47,142.32 = 20,354.47/x
3. Step 3: Cross multiply
   31,401.56x = 47,142.32 × 20,354.47
4. Step 4: Simplify right side
   31,401.56x = 959,556,938.17
5. Step 5: Solve for x
   x = 959,556,938.17/31,401.56
6. Step 6: Final answer
   x = 30,557.62