Finding the Fourth Proportional to 1,564.03, 2,158.37 and 900.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,564.03 : 2,158.37 = 900.87 : x
2. Step 2: Convert to fraction form
   1,564.03/2,158.37 = 900.87/x
3. Step 3: Cross multiply
   1,564.03x = 2,158.37 × 900.87
4. Step 4: Simplify right side
   1,564.03x = 1,944,410.78
5. Step 5: Solve for x
   x = 1,944,410.78/1,564.03
6. Step 6: Final answer
   x = 1,243.21