Finding the Fourth Proportional to 31,498.18, 47,220.45 and 13,958.44

Step by Step Solution

1. Step 1: Write the proportion equation
   31,498.18 : 47,220.45 = 13,958.44 : x
2. Step 2: Convert to fraction form
   31,498.18/47,220.45 = 13,958.44/x
3. Step 3: Cross multiply
   31,498.18x = 47,220.45 × 13,958.44
4. Step 4: Simplify right side
   31,498.18x = 659,123,818.10
5. Step 5: Solve for x
   x = 659,123,818.10/31,498.18
6. Step 6: Final answer
   x = 20,925.77