Finding the Fourth Proportional to 2,479.72, 3,422.52 and 1,431.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,479.72 : 3,422.52 = 1,431.64 : x
2. Step 2: Convert to fraction form
   2,479.72/3,422.52 = 1,431.64/x
3. Step 3: Cross multiply
   2,479.72x = 3,422.52 × 1,431.64
4. Step 4: Simplify right side
   2,479.72x = 4,899,816.53
5. Step 5: Solve for x
   x = 4,899,816.53/2,479.72
6. Step 6: Final answer
   x = 1,975.96