Finding the Fourth Proportional to 1,563.10, 2,157.78 and 996.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.10 : 2,157.78 = 996.18 : x
2. Step 2: Convert to fraction form
   1,563.10/2,157.78 = 996.18/x
3. Step 3: Cross multiply
   1,563.10x = 2,157.78 × 996.18
4. Step 4: Simplify right side
   1,563.10x = 2,149,537.28
5. Step 5: Solve for x
   x = 2,149,537.28/1,563.10
6. Step 6: Final answer
   x = 1,375.18