Finding the Fourth Proportional to 8,661.69, 12,983.46 and 4,908.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,661.69 : 12,983.46 = 4,908.78 : x
2. Step 2: Convert to fraction form
   8,661.69/12,983.46 = 4,908.78/x
3. Step 3: Cross multiply
   8,661.69x = 12,983.46 × 4,908.78
4. Step 4: Simplify right side
   8,661.69x = 63,732,948.78
5. Step 5: Solve for x
   x = 63,732,948.78/8,661.69
6. Step 6: Final answer
   x = 7,358.03