Finding the Fourth Proportional to 8,642.61, 12,951.76 and 4,939.29

Step by Step Solution

1. Step 1: Write the proportion equation
   8,642.61 : 12,951.76 = 4,939.29 : x
2. Step 2: Convert to fraction form
   8,642.61/12,951.76 = 4,939.29/x
3. Step 3: Cross multiply
   8,642.61x = 12,951.76 × 4,939.29
4. Step 4: Simplify right side
   8,642.61x = 63,972,498.65
5. Step 5: Solve for x
   x = 63,972,498.65/8,642.61
6. Step 6: Final answer
   x = 7,401.99