Finding the Fourth Proportional to 12,868.54, 17,767 and 9,899.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,868.54 : 17,767 = 9,899.88 : x
2. Step 2: Convert to fraction form
   12,868.54/17,767 = 9,899.88/x
3. Step 3: Cross multiply
   12,868.54x = 17,767 × 9,899.88
4. Step 4: Simplify right side
   12,868.54x = 175,891,167.96
5. Step 5: Solve for x
   x = 175,891,167.96/12,868.54
6. Step 6: Final answer
   x = 13,668.31