Finding the Fourth Proportional to 12,844.60, 17,721.39 and 7,540.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,844.60 : 17,721.39 = 7,540.72 : x
2. Step 2: Convert to fraction form
   12,844.60/17,721.39 = 7,540.72/x
3. Step 3: Cross multiply
   12,844.60x = 17,721.39 × 7,540.72
4. Step 4: Simplify right side
   12,844.60x = 133,632,040.00
5. Step 5: Solve for x
   x = 133,632,040.00/12,844.60
6. Step 6: Final answer
   x = 10,403.75