Finding the Fourth Proportional to 1,433.87, 2,145.94 and 857.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.87 : 2,145.94 = 857.15 : x
2. Step 2: Convert to fraction form
   1,433.87/2,145.94 = 857.15/x
3. Step 3: Cross multiply
   1,433.87x = 2,145.94 × 857.15
4. Step 4: Simplify right side
   1,433.87x = 1,839,392.47
5. Step 5: Solve for x
   x = 1,839,392.47/1,433.87
6. Step 6: Final answer
   x = 1,282.82