Finding the Fourth Proportional to 6,389.88, 8,819.84 and 3,872.76

Step by Step Solution

1. Step 1: Write the proportion equation
   6,389.88 : 8,819.84 = 3,872.76 : x
2. Step 2: Convert to fraction form
   6,389.88/8,819.84 = 3,872.76/x
3. Step 3: Cross multiply
   6,389.88x = 8,819.84 × 3,872.76
4. Step 4: Simplify right side
   6,389.88x = 34,157,123.56
5. Step 5: Solve for x
   x = 34,157,123.56/6,389.88
6. Step 6: Final answer
   x = 5,345.50