Finding the Fourth Proportional to 1,563.94, 2,158.59 and 900.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.94 : 2,158.59 = 900.91 : x
2. Step 2: Convert to fraction form
   1,563.94/2,158.59 = 900.91/x
3. Step 3: Cross multiply
   1,563.94x = 2,158.59 × 900.91
4. Step 4: Simplify right side
   1,563.94x = 1,944,695.32
5. Step 5: Solve for x
   x = 1,944,695.32/1,563.94
6. Step 6: Final answer
   x = 1,243.46