Finding the Fourth Proportional to 31,865.32, 47,789.34 and 13,393

Step by Step Solution

1. Step 1: Write the proportion equation
   31,865.32 : 47,789.34 = 13,393 : x
2. Step 2: Convert to fraction form
   31,865.32/47,789.34 = 13,393/x
3. Step 3: Cross multiply
   31,865.32x = 47,789.34 × 13,393
4. Step 4: Simplify right side
   31,865.32x = 640,042,630.62
5. Step 5: Solve for x
   x = 640,042,630.62/31,865.32
6. Step 6: Final answer
   x = 20,085.87