Finding the Fourth Proportional to 1,408.06, 1,943.28 and 810.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.06 : 1,943.28 = 810.74 : x
2. Step 2: Convert to fraction form
   1,408.06/1,943.28 = 810.74/x
3. Step 3: Cross multiply
   1,408.06x = 1,943.28 × 810.74
4. Step 4: Simplify right side
   1,408.06x = 1,575,494.83
5. Step 5: Solve for x
   x = 1,575,494.83/1,408.06
6. Step 6: Final answer
   x = 1,118.91