Finding the Fourth Proportional to 6,438.72, 8,863.82 and 5,729.46

Step by Step Solution

1. Step 1: Write the proportion equation
   6,438.72 : 8,863.82 = 5,729.46 : x
2. Step 2: Convert to fraction form
   6,438.72/8,863.82 = 5,729.46/x
3. Step 3: Cross multiply
   6,438.72x = 8,863.82 × 5,729.46
4. Step 4: Simplify right side
   6,438.72x = 50,784,873.49
5. Step 5: Solve for x
   x = 50,784,873.49/6,438.72
6. Step 6: Final answer
   x = 7,887.42