Finding the Fourth Proportional to 8,378.30, 12,576.69 and 7,078.13

Step by Step Solution

1. Step 1: Write the proportion equation
   8,378.30 : 12,576.69 = 7,078.13 : x
2. Step 2: Convert to fraction form
   8,378.30/12,576.69 = 7,078.13/x
3. Step 3: Cross multiply
   8,378.30x = 12,576.69 × 7,078.13
4. Step 4: Simplify right side
   8,378.30x = 89,019,521.72
5. Step 5: Solve for x
   x = 89,019,521.72/8,378.30
6. Step 6: Final answer
   x = 10,625.01