Finding the Fourth Proportional to 13,642.32, 18,819.72 and 8,327.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,642.32 : 18,819.72 = 8,327.91 : x
2. Step 2: Convert to fraction form
   13,642.32/18,819.72 = 8,327.91/x
3. Step 3: Cross multiply
   13,642.32x = 18,819.72 × 8,327.91
4. Step 4: Simplify right side
   13,642.32x = 156,728,934.39
5. Step 5: Solve for x
   x = 156,728,934.39/13,642.32
6. Step 6: Final answer
   x = 11,488.44