Finding the Fourth Proportional to 22,826.88, 31,498.56 and 12,890.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,826.88 : 31,498.56 = 12,890.88 : x
2. Step 2: Convert to fraction form
   22,826.88/31,498.56 = 12,890.88/x
3. Step 3: Cross multiply
   22,826.88x = 31,498.56 × 12,890.88
4. Step 4: Simplify right side
   22,826.88x = 406,044,157.13
5. Step 5: Solve for x
   x = 406,044,157.13/22,826.88
6. Step 6: Final answer
   x = 17,787.98