Finding the Fourth Proportional to 1,621.94, 2,432.39 and 800.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.94 : 2,432.39 = 800.78 : x
2. Step 2: Convert to fraction form
   1,621.94/2,432.39 = 800.78/x
3. Step 3: Cross multiply
   1,621.94x = 2,432.39 × 800.78
4. Step 4: Simplify right side
   1,621.94x = 1,947,793.10
5. Step 5: Solve for x
   x = 1,947,793.10/1,621.94
6. Step 6: Final answer
   x = 1,200.91