Finding the Fourth Proportional to 1,603.50, 2,212.83 and 905.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.50 : 2,212.83 = 905.01 : x
2. Step 2: Convert to fraction form
   1,603.50/2,212.83 = 905.01/x
3. Step 3: Cross multiply
   1,603.50x = 2,212.83 × 905.01
4. Step 4: Simplify right side
   1,603.50x = 2,002,633.28
5. Step 5: Solve for x
   x = 2,002,633.28/1,603.50
6. Step 6: Final answer
   x = 1,248.91