Finding the Fourth Proportional to 12,879.86, 19,325.46 and 5,485.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,879.86 : 19,325.46 = 5,485.10 : x
2. Step 2: Convert to fraction form
   12,879.86/19,325.46 = 5,485.10/x
3. Step 3: Cross multiply
   12,879.86x = 19,325.46 × 5,485.10
4. Step 4: Simplify right side
   12,879.86x = 106,002,080.65
5. Step 5: Solve for x
   x = 106,002,080.65/12,879.86
6. Step 6: Final answer
   x = 8,230.06