Finding the Fourth Proportional to 31,430.48, 47,141.46 and 12,454.83

Step by Step Solution

1. Step 1: Write the proportion equation
   31,430.48 : 47,141.46 = 12,454.83 : x
2. Step 2: Convert to fraction form
   31,430.48/47,141.46 = 12,454.83/x
3. Step 3: Cross multiply
   31,430.48x = 47,141.46 × 12,454.83
4. Step 4: Simplify right side
   31,430.48x = 587,138,870.25
5. Step 5: Solve for x
   x = 587,138,870.25/31,430.48
6. Step 6: Final answer
   x = 18,680.56