Finding the Fourth Proportional to 1,436.31, 2,151.39 and 819.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.31 : 2,151.39 = 819.69 : x
2. Step 2: Convert to fraction form
   1,436.31/2,151.39 = 819.69/x
3. Step 3: Cross multiply
   1,436.31x = 2,151.39 × 819.69
4. Step 4: Simplify right side
   1,436.31x = 1,763,472.87
5. Step 5: Solve for x
   x = 1,763,472.87/1,436.31
6. Step 6: Final answer
   x = 1,227.78