Finding the Fourth Proportional to 13,017.40, 17,960.88 and 7,713.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,017.40 : 17,960.88 = 7,713.52 : x
2. Step 2: Convert to fraction form
   13,017.40/17,960.88 = 7,713.52/x
3. Step 3: Cross multiply
   13,017.40x = 17,960.88 × 7,713.52
4. Step 4: Simplify right side
   13,017.40x = 138,541,607.10
5. Step 5: Solve for x
   x = 138,541,607.10/13,017.40
6. Step 6: Final answer
   x = 10,642.80