Finding the Fourth Proportional to 8,513.83, 12,778.47 and 4,356.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,513.83 : 12,778.47 = 4,356.71 : x
2. Step 2: Convert to fraction form
   8,513.83/12,778.47 = 4,356.71/x
3. Step 3: Cross multiply
   8,513.83x = 12,778.47 × 4,356.71
4. Step 4: Simplify right side
   8,513.83x = 55,672,088.03
5. Step 5: Solve for x
   x = 55,672,088.03/8,513.83
6. Step 6: Final answer
   x = 6,539.02