Finding the Fourth Proportional to 12,563.78, 17,339.82 and 7,528.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,563.78 : 17,339.82 = 7,528.20 : x
2. Step 2: Convert to fraction form
   12,563.78/17,339.82 = 7,528.20/x
3. Step 3: Cross multiply
   12,563.78x = 17,339.82 × 7,528.20
4. Step 4: Simplify right side
   12,563.78x = 130,537,632.92
5. Step 5: Solve for x
   x = 130,537,632.92/12,563.78
6. Step 6: Final answer
   x = 10,390.00