Finding the Fourth Proportional to 1,408.05, 1,943.76 and 818.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.05 : 1,943.76 = 818.47 : x
2. Step 2: Convert to fraction form
   1,408.05/1,943.76 = 818.47/x
3. Step 3: Cross multiply
   1,408.05x = 1,943.76 × 818.47
4. Step 4: Simplify right side
   1,408.05x = 1,590,909.25
5. Step 5: Solve for x
   x = 1,590,909.25/1,408.05
6. Step 6: Final answer
   x = 1,129.87