Finding the Fourth Proportional to 31,488.66, 47,237.31 and 13,958.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,488.66 : 47,237.31 = 13,958.10 : x
2. Step 2: Convert to fraction form
   31,488.66/47,237.31 = 13,958.10/x
3. Step 3: Cross multiply
   31,488.66x = 47,237.31 × 13,958.10
4. Step 4: Simplify right side
   31,488.66x = 659,343,096.71
5. Step 5: Solve for x
   x = 659,343,096.71/31,488.66
6. Step 6: Final answer
   x = 20,939.06