Finding the Fourth Proportional to 12,807.19, 17,667.16 and 8,821.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,807.19 : 17,667.16 = 8,821.41 : x
2. Step 2: Convert to fraction form
   12,807.19/17,667.16 = 8,821.41/x
3. Step 3: Cross multiply
   12,807.19x = 17,667.16 × 8,821.41
4. Step 4: Simplify right side
   12,807.19x = 155,849,261.90
5. Step 5: Solve for x
   x = 155,849,261.90/12,807.19
6. Step 6: Final answer
   x = 12,168.89