Finding the Fourth Proportional to 12,868.20, 17,752.88 and 7,828.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,868.20 : 17,752.88 = 7,828.38 : x
2. Step 2: Convert to fraction form
   12,868.20/17,752.88 = 7,828.38/x
3. Step 3: Cross multiply
   12,868.20x = 17,752.88 × 7,828.38
4. Step 4: Simplify right side
   12,868.20x = 138,976,290.73
5. Step 5: Solve for x
   x = 138,976,290.73/12,868.20
6. Step 6: Final answer
   x = 10,799.98