Finding the Fourth Proportional to 1,603.50, 2,212.85 and 904.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.50 : 2,212.85 = 904.88 : x
2. Step 2: Convert to fraction form
   1,603.50/2,212.85 = 904.88/x
3. Step 3: Cross multiply
   1,603.50x = 2,212.85 × 904.88
4. Step 4: Simplify right side
   1,603.50x = 2,002,363.71
5. Step 5: Solve for x
   x = 2,002,363.71/1,603.50
6. Step 6: Final answer
   x = 1,248.75