Finding the Fourth Proportional to 1,408.14, 1,943.10 and 818.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.14 : 1,943.10 = 818.71 : x
2. Step 2: Convert to fraction form
   1,408.14/1,943.10 = 818.71/x
3. Step 3: Cross multiply
   1,408.14x = 1,943.10 × 818.71
4. Step 4: Simplify right side
   1,408.14x = 1,590,830.54
5. Step 5: Solve for x
   x = 1,590,830.54/1,408.14
6. Step 6: Final answer
   x = 1,129.74