Finding the Fourth Proportional to 21,319.58, 31,990.17 and 14,379.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,319.58 : 31,990.17 = 14,379.50 : x
2. Step 2: Convert to fraction form
   21,319.58/31,990.17 = 14,379.50/x
3. Step 3: Cross multiply
   21,319.58x = 31,990.17 × 14,379.50
4. Step 4: Simplify right side
   21,319.58x = 460,002,649.52
5. Step 5: Solve for x
   x = 460,002,649.52/21,319.58
6. Step 6: Final answer
   x = 21,576.53