Finding the Fourth Proportional to 13,389.68, 18,470.28 and 8,354.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,389.68 : 18,470.28 = 8,354.72 : x
2. Step 2: Convert to fraction form
   13,389.68/18,470.28 = 8,354.72/x
3. Step 3: Cross multiply
   13,389.68x = 18,470.28 × 8,354.72
4. Step 4: Simplify right side
   13,389.68x = 154,314,017.72
5. Step 5: Solve for x
   x = 154,314,017.72/13,389.68
6. Step 6: Final answer
   x = 11,524.85