Finding the Fourth Proportional to 1,408.57, 2,105.65 and 1,039.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.57 : 2,105.65 = 1,039.93 : x
2. Step 2: Convert to fraction form
   1,408.57/2,105.65 = 1,039.93/x
3. Step 3: Cross multiply
   1,408.57x = 2,105.65 × 1,039.93
4. Step 4: Simplify right side
   1,408.57x = 2,189,731.20
5. Step 5: Solve for x
   x = 2,189,731.20/1,408.57
6. Step 6: Final answer
   x = 1,554.58