Finding the Fourth Proportional to 6,403.89, 8,839.81 and 4,815.15

Step by Step Solution

1. Step 1: Write the proportion equation
   6,403.89 : 8,839.81 = 4,815.15 : x
2. Step 2: Convert to fraction form
   6,403.89/8,839.81 = 4,815.15/x
3. Step 3: Cross multiply
   6,403.89x = 8,839.81 × 4,815.15
4. Step 4: Simplify right side
   6,403.89x = 42,565,038.26
5. Step 5: Solve for x
   x = 42,565,038.26/6,403.89
6. Step 6: Final answer
   x = 6,646.74