Finding the Fourth Proportional to 1,563.89, 2,158.18 and 900.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.89 : 2,158.18 = 900.74 : x
2. Step 2: Convert to fraction form
   1,563.89/2,158.18 = 900.74/x
3. Step 3: Cross multiply
   1,563.89x = 2,158.18 × 900.74
4. Step 4: Simplify right side
   1,563.89x = 1,943,950.06
5. Step 5: Solve for x
   x = 1,943,950.06/1,563.89
6. Step 6: Final answer
   x = 1,243.02