Finding the Fourth Proportional to 2,479.85, 3,422.69 and 1,431.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,479.85 : 3,422.69 = 1,431.77 : x
2. Step 2: Convert to fraction form
   2,479.85/3,422.69 = 1,431.77/x
3. Step 3: Cross multiply
   2,479.85x = 3,422.69 × 1,431.77
4. Step 4: Simplify right side
   2,479.85x = 4,900,491.33
5. Step 5: Solve for x
   x = 4,900,491.33/2,479.85
6. Step 6: Final answer
   x = 1,976.13