Finding the Fourth Proportional to 1,408.12, 1,943.61 and 818.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.12 : 1,943.61 = 818.89 : x
2. Step 2: Convert to fraction form
   1,408.12/1,943.61 = 818.89/x
3. Step 3: Cross multiply
   1,408.12x = 1,943.61 × 818.89
4. Step 4: Simplify right side
   1,408.12x = 1,591,602.79
5. Step 5: Solve for x
   x = 1,591,602.79/1,408.12
6. Step 6: Final answer
   x = 1,130.30