Finding the Fourth Proportional to 13,178.06, 18,180.61 and 8,397.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,178.06 : 18,180.61 = 8,397.15 : x
2. Step 2: Convert to fraction form
   13,178.06/18,180.61 = 8,397.15/x
3. Step 3: Cross multiply
   13,178.06x = 18,180.61 × 8,397.15
4. Step 4: Simplify right side
   13,178.06x = 152,665,309.26
5. Step 5: Solve for x
   x = 152,665,309.26/13,178.06
6. Step 6: Final answer
   x = 11,584.81