Finding the Fourth Proportional to 12,561.57, 17,336.61 and 7,256.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,561.57 : 17,336.61 = 7,256.43 : x
2. Step 2: Convert to fraction form
   12,561.57/17,336.61 = 7,256.43/x
3. Step 3: Cross multiply
   12,561.57x = 17,336.61 × 7,256.43
4. Step 4: Simplify right side
   12,561.57x = 125,801,896.90
5. Step 5: Solve for x
   x = 125,801,896.90/12,561.57
6. Step 6: Final answer
   x = 10,014.82