Finding the Fourth Proportional to 1,563.45, 2,157.83 and 900.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.45 : 2,157.83 = 900.18 : x
2. Step 2: Convert to fraction form
   1,563.45/2,157.83 = 900.18/x
3. Step 3: Cross multiply
   1,563.45x = 2,157.83 × 900.18
4. Step 4: Simplify right side
   1,563.45x = 1,942,435.41
5. Step 5: Solve for x
   x = 1,942,435.41/1,563.45
6. Step 6: Final answer
   x = 1,242.40