Finding the Fourth Proportional to 8,605.86, 12,894.69 and 5,309.55

Step by Step Solution

1. Step 1: Write the proportion equation
   8,605.86 : 12,894.69 = 5,309.55 : x
2. Step 2: Convert to fraction form
   8,605.86/12,894.69 = 5,309.55/x
3. Step 3: Cross multiply
   8,605.86x = 12,894.69 × 5,309.55
4. Step 4: Simplify right side
   8,605.86x = 68,465,001.29
5. Step 5: Solve for x
   x = 68,465,001.29/8,605.86
6. Step 6: Final answer
   x = 7,955.63