Finding the Fourth Proportional to 13,178.62, 18,184.70 and 7,872.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,178.62 : 18,184.70 = 7,872.31 : x
2. Step 2: Convert to fraction form
   13,178.62/18,184.70 = 7,872.31/x
3. Step 3: Cross multiply
   13,178.62x = 18,184.70 × 7,872.31
4. Step 4: Simplify right side
   13,178.62x = 143,155,510.83
5. Step 5: Solve for x
   x = 143,155,510.83/13,178.62
6. Step 6: Final answer
   x = 10,862.71