Finding the Fourth Proportional to 17,499.52, 26,220.12 and 12,561.76

Step by Step Solution

1. Step 1: Write the proportion equation
   17,499.52 : 26,220.12 = 12,561.76 : x
2. Step 2: Convert to fraction form
   17,499.52/26,220.12 = 12,561.76/x
3. Step 3: Cross multiply
   17,499.52x = 26,220.12 × 12,561.76
4. Step 4: Simplify right side
   17,499.52x = 329,370,854.61
5. Step 5: Solve for x
   x = 329,370,854.61/17,499.52
6. Step 6: Final answer
   x = 18,821.71