Finding the Fourth Proportional to 1,435.28, 2,143.18 and 1,139.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.28 : 2,143.18 = 1,139.46 : x
2. Step 2: Convert to fraction form
   1,435.28/2,143.18 = 1,139.46/x
3. Step 3: Cross multiply
   1,435.28x = 2,143.18 × 1,139.46
4. Step 4: Simplify right side
   1,435.28x = 2,442,061.27
5. Step 5: Solve for x
   x = 2,442,061.27/1,435.28
6. Step 6: Final answer
   x = 1,701.46