Finding the Fourth Proportional to 1,380.40, 1,902.36 and 1,143.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.40 : 1,902.36 = 1,143.52 : x
2. Step 2: Convert to fraction form
   1,380.40/1,902.36 = 1,143.52/x
3. Step 3: Cross multiply
   1,380.40x = 1,902.36 × 1,143.52
4. Step 4: Simplify right side
   1,380.40x = 2,175,386.71
5. Step 5: Solve for x
   x = 2,175,386.71/1,380.40
6. Step 6: Final answer
   x = 1,575.91