Finding the Fourth Proportional to 1,436.55, 2,151.78 and 819.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.55 : 2,151.78 = 819.93 : x
2. Step 2: Convert to fraction form
   1,436.55/2,151.78 = 819.93/x
3. Step 3: Cross multiply
   1,436.55x = 2,151.78 × 819.93
4. Step 4: Simplify right side
   1,436.55x = 1,764,308.98
5. Step 5: Solve for x
   x = 1,764,308.98/1,436.55
6. Step 6: Final answer
   x = 1,228.16