Finding the Fourth Proportional to 12,665.19, 17,470.17 and 7,887.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.19 : 17,470.17 = 7,887.54 : x
2. Step 2: Convert to fraction form
   12,665.19/17,470.17 = 7,887.54/x
3. Step 3: Cross multiply
   12,665.19x = 17,470.17 × 7,887.54
4. Step 4: Simplify right side
   12,665.19x = 137,796,664.68
5. Step 5: Solve for x
   x = 137,796,664.68/12,665.19
6. Step 6: Final answer
   x = 10,879.95