Finding the Fourth Proportional to 13,320.32, 18,388.71 and 8,286.17

Step by Step Solution

1. Step 1: Write the proportion equation
   13,320.32 : 18,388.71 = 8,286.17 : x
2. Step 2: Convert to fraction form
   13,320.32/18,388.71 = 8,286.17/x
3. Step 3: Cross multiply
   13,320.32x = 18,388.71 × 8,286.17
4. Step 4: Simplify right side
   13,320.32x = 152,371,885.20
5. Step 5: Solve for x
   x = 152,371,885.20/13,320.32
6. Step 6: Final answer
   x = 11,439.06