Finding the Fourth Proportional to 1,404.11, 2,105.55 and 819.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.11 : 2,105.55 = 819.69 : x
2. Step 2: Convert to fraction form
   1,404.11/2,105.55 = 819.69/x
3. Step 3: Cross multiply
   1,404.11x = 2,105.55 × 819.69
4. Step 4: Simplify right side
   1,404.11x = 1,725,898.28
5. Step 5: Solve for x
   x = 1,725,898.28/1,404.11
6. Step 6: Final answer
   x = 1,229.18