Finding the Fourth Proportional to 12,819.72, 17,686.28 and 7,512.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,819.72 : 17,686.28 = 7,512.60 : x
2. Step 2: Convert to fraction form
   12,819.72/17,686.28 = 7,512.60/x
3. Step 3: Cross multiply
   12,819.72x = 17,686.28 × 7,512.60
4. Step 4: Simplify right side
   12,819.72x = 132,869,947.13
5. Step 5: Solve for x
   x = 132,869,947.13/12,819.72
6. Step 6: Final answer
   x = 10,364.50