Finding the Fourth Proportional to 31,728.51, 47,589.12 and 8,354.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,728.51 : 47,589.12 = 8,354.34 : x
2. Step 2: Convert to fraction form
   31,728.51/47,589.12 = 8,354.34/x
3. Step 3: Cross multiply
   31,728.51x = 47,589.12 × 8,354.34
4. Step 4: Simplify right side
   31,728.51x = 397,575,688.78
5. Step 5: Solve for x
   x = 397,575,688.78/31,728.51
6. Step 6: Final answer
   x = 12,530.55