Finding the Fourth Proportional to 12,875.40, 17,769.84 and 8,160.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,875.40 : 17,769.84 = 8,160.12 : x
2. Step 2: Convert to fraction form
   12,875.40/17,769.84 = 8,160.12/x
3. Step 3: Cross multiply
   12,875.40x = 17,769.84 × 8,160.12
4. Step 4: Simplify right side
   12,875.40x = 145,004,026.78
5. Step 5: Solve for x
   x = 145,004,026.78/12,875.40
6. Step 6: Final answer
   x = 11,262.10