Finding the Fourth Proportional to 12,866.72, 17,751.36 and 7,828.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,866.72 : 17,751.36 = 7,828.88 : x
2. Step 2: Convert to fraction form
   12,866.72/17,751.36 = 7,828.88/x
3. Step 3: Cross multiply
   12,866.72x = 17,751.36 × 7,828.88
4. Step 4: Simplify right side
   12,866.72x = 138,973,267.28
5. Step 5: Solve for x
   x = 138,973,267.28/12,866.72
6. Step 6: Final answer
   x = 10,800.99