Finding the Fourth Proportional to 6,406.83, 9,615.10 and 4,321.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,406.83 : 9,615.10 = 4,321.89 : x
2. Step 2: Convert to fraction form
   6,406.83/9,615.10 = 4,321.89/x
3. Step 3: Cross multiply
   6,406.83x = 9,615.10 × 4,321.89
4. Step 4: Simplify right side
   6,406.83x = 41,555,404.54
5. Step 5: Solve for x
   x = 41,555,404.54/6,406.83
6. Step 6: Final answer
   x = 6,486.11