Finding the Fourth Proportional to 1,563.10, 2,157.81 and 899.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.10 : 2,157.81 = 899.82 : x
2. Step 2: Convert to fraction form
   1,563.10/2,157.81 = 899.82/x
3. Step 3: Cross multiply
   1,563.10x = 2,157.81 × 899.82
4. Step 4: Simplify right side
   1,563.10x = 1,941,640.59
5. Step 5: Solve for x
   x = 1,941,640.59/1,563.10
6. Step 6: Final answer
   x = 1,242.17