Finding the Fourth Proportional to 1,404.18, 2,105.78 and 818.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.18 : 2,105.78 = 818.96 : x
2. Step 2: Convert to fraction form
   1,404.18/2,105.78 = 818.96/x
3. Step 3: Cross multiply
   1,404.18x = 2,105.78 × 818.96
4. Step 4: Simplify right side
   1,404.18x = 1,724,549.59
5. Step 5: Solve for x
   x = 1,724,549.59/1,404.18
6. Step 6: Final answer
   x = 1,228.15