Finding the Fourth Proportional to 1,563.78, 2,157.67 and 996.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.78 : 2,157.67 = 996.83 : x
2. Step 2: Convert to fraction form
   1,563.78/2,157.67 = 996.83/x
3. Step 3: Cross multiply
   1,563.78x = 2,157.67 × 996.83
4. Step 4: Simplify right side
   1,563.78x = 2,150,826.56
5. Step 5: Solve for x
   x = 2,150,826.56/1,563.78
6. Step 6: Final answer
   x = 1,375.41