Finding the Fourth Proportional to 12,686.94, 17,501.04 and 7,648.11

Step by Step Solution

1. Step 1: Write the proportion equation
   12,686.94 : 17,501.04 = 7,648.11 : x
2. Step 2: Convert to fraction form
   12,686.94/17,501.04 = 7,648.11/x
3. Step 3: Cross multiply
   12,686.94x = 17,501.04 × 7,648.11
4. Step 4: Simplify right side
   12,686.94x = 133,849,879.03
5. Step 5: Solve for x
   x = 133,849,879.03/12,686.94
6. Step 6: Final answer
   x = 10,550.21