Finding the Fourth Proportional to 9,260.78, 12,779.88 and 5,069.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,260.78 : 12,779.88 = 5,069.12 : x
2. Step 2: Convert to fraction form
   9,260.78/12,779.88 = 5,069.12/x
3. Step 3: Cross multiply
   9,260.78x = 12,779.88 × 5,069.12
4. Step 4: Simplify right side
   9,260.78x = 64,782,745.31
5. Step 5: Solve for x
   x = 64,782,745.31/9,260.78
6. Step 6: Final answer
   x = 6,995.39