Finding the Fourth Proportional to 6,456.90, 8,910.72 and 4,571.86

Step by Step Solution

1. Step 1: Write the proportion equation
   6,456.90 : 8,910.72 = 4,571.86 : x
2. Step 2: Convert to fraction form
   6,456.90/8,910.72 = 4,571.86/x
3. Step 3: Cross multiply
   6,456.90x = 8,910.72 × 4,571.86
4. Step 4: Simplify right side
   6,456.90x = 40,738,564.34
5. Step 5: Solve for x
   x = 40,738,564.34/6,456.90
6. Step 6: Final answer
   x = 6,309.31