Finding the Fourth Proportional to 1,563.72, 2,157.47 and 900.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.72 : 2,157.47 = 900.56 : x
2. Step 2: Convert to fraction form
   1,563.72/2,157.47 = 900.56/x
3. Step 3: Cross multiply
   1,563.72x = 2,157.47 × 900.56
4. Step 4: Simplify right side
   1,563.72x = 1,942,931.18
5. Step 5: Solve for x
   x = 1,942,931.18/1,563.72
6. Step 6: Final answer
   x = 1,242.51