Finding the Fourth Proportional to 1,404.62, 2,113.18 and 857.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.62 : 2,113.18 = 857.24 : x
2. Step 2: Convert to fraction form
   1,404.62/2,113.18 = 857.24/x
3. Step 3: Cross multiply
   1,404.62x = 2,113.18 × 857.24
4. Step 4: Simplify right side
   1,404.62x = 1,811,502.42
5. Step 5: Solve for x
   x = 1,811,502.42/1,404.62
6. Step 6: Final answer
   x = 1,289.67