Finding the Fourth Proportional to 12,819.57, 17,689.50 and 7,440.77

Step by Step Solution

1. Step 1: Write the proportion equation
   12,819.57 : 17,689.50 = 7,440.77 : x
2. Step 2: Convert to fraction form
   12,819.57/17,689.50 = 7,440.77/x
3. Step 3: Cross multiply
   12,819.57x = 17,689.50 × 7,440.77
4. Step 4: Simplify right side
   12,819.57x = 131,623,412.47
5. Step 5: Solve for x
   x = 131,623,412.47/12,819.57
6. Step 6: Final answer
   x = 10,267.38