Finding the Fourth Proportional to 1,429.55, 2,142.30 and 1,255.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.55 : 2,142.30 = 1,255.40 : x
2. Step 2: Convert to fraction form
   1,429.55/2,142.30 = 1,255.40/x
3. Step 3: Cross multiply
   1,429.55x = 2,142.30 × 1,255.40
4. Step 4: Simplify right side
   1,429.55x = 2,689,443.42
5. Step 5: Solve for x
   x = 2,689,443.42/1,429.55
6. Step 6: Final answer
   x = 1,881.32