Finding the Fourth Proportional to 12,725.78, 17,561.55 and 7,061.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,725.78 : 17,561.55 = 7,061.40 : x
2. Step 2: Convert to fraction form
   12,725.78/17,561.55 = 7,061.40/x
3. Step 3: Cross multiply
   12,725.78x = 17,561.55 × 7,061.40
4. Step 4: Simplify right side
   12,725.78x = 124,009,129.17
5. Step 5: Solve for x
   x = 124,009,129.17/12,725.78
6. Step 6: Final answer
   x = 9,744.72