Finding the Fourth Proportional to 8,642.38, 12,964.83 and 4,260.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,642.38 : 12,964.83 = 4,260.10 : x
2. Step 2: Convert to fraction form
   8,642.38/12,964.83 = 4,260.10/x
3. Step 3: Cross multiply
   8,642.38x = 12,964.83 × 4,260.10
4. Step 4: Simplify right side
   8,642.38x = 55,231,472.28
5. Step 5: Solve for x
   x = 55,231,472.28/8,642.38
6. Step 6: Final answer
   x = 6,390.77