Finding the Fourth Proportional to 2,879.55, 4,317.30 and 1,320.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,879.55 : 4,317.30 = 1,320.30 : x
2. Step 2: Convert to fraction form
   2,879.55/4,317.30 = 1,320.30/x
3. Step 3: Cross multiply
   2,879.55x = 4,317.30 × 1,320.30
4. Step 4: Simplify right side
   2,879.55x = 5,700,131.19
5. Step 5: Solve for x
   x = 5,700,131.19/2,879.55
6. Step 6: Final answer
   x = 1,979.52