Finding the Fourth Proportional to 1,404.22, 2,103.31 and 1,139.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.22 : 2,103.31 = 1,139.49 : x
2. Step 2: Convert to fraction form
   1,404.22/2,103.31 = 1,139.49/x
3. Step 3: Cross multiply
   1,404.22x = 2,103.31 × 1,139.49
4. Step 4: Simplify right side
   1,404.22x = 2,396,700.71
5. Step 5: Solve for x
   x = 2,396,700.71/1,404.22
6. Step 6: Final answer
   x = 1,706.78