Finding the Fourth Proportional to 31,401.78, 47,109.18 and 9,215.88

Step by Step Solution

1. Step 1: Write the proportion equation
   31,401.78 : 47,109.18 = 9,215.88 : x
2. Step 2: Convert to fraction form
   31,401.78/47,109.18 = 9,215.88/x
3. Step 3: Cross multiply
   31,401.78x = 47,109.18 × 9,215.88
4. Step 4: Simplify right side
   31,401.78x = 434,152,549.78
5. Step 5: Solve for x
   x = 434,152,549.78/31,401.78
6. Step 6: Final answer
   x = 13,825.73