Finding the Fourth Proportional to 8,616.86, 12,914.86 and 3,930.45

Step by Step Solution

1. Step 1: Write the proportion equation
   8,616.86 : 12,914.86 = 3,930.45 : x
2. Step 2: Convert to fraction form
   8,616.86/12,914.86 = 3,930.45/x
3. Step 3: Cross multiply
   8,616.86x = 12,914.86 × 3,930.45
4. Step 4: Simplify right side
   8,616.86x = 50,761,191.83
5. Step 5: Solve for x
   x = 50,761,191.83/8,616.86
6. Step 6: Final answer
   x = 5,890.92