Finding the Fourth Proportional to 13,947.20, 19,247.57 and 7,659.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,947.20 : 19,247.57 = 7,659.57 : x
2. Step 2: Convert to fraction form
   13,947.20/19,247.57 = 7,659.57/x
3. Step 3: Cross multiply
   13,947.20x = 19,247.57 × 7,659.57
4. Step 4: Simplify right side
   13,947.20x = 147,428,128.89
5. Step 5: Solve for x
   x = 147,428,128.89/13,947.20
6. Step 6: Final answer
   x = 10,570.45