Finding the Fourth Proportional to 8,605.43, 12,906.61 and 5,476.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,605.43 : 12,906.61 = 5,476.15 : x
2. Step 2: Convert to fraction form
   8,605.43/12,906.61 = 5,476.15/x
3. Step 3: Cross multiply
   8,605.43x = 12,906.61 × 5,476.15
4. Step 4: Simplify right side
   8,605.43x = 70,678,532.35
5. Step 5: Solve for x
   x = 70,678,532.35/8,605.43
6. Step 6: Final answer
   x = 8,213.25