Finding the Fourth Proportional to 1,603.80, 2,213.22 and 885.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.80 : 2,213.22 = 885.98 : x
2. Step 2: Convert to fraction form
   1,603.80/2,213.22 = 885.98/x
3. Step 3: Cross multiply
   1,603.80x = 2,213.22 × 885.98
4. Step 4: Simplify right side
   1,603.80x = 1,960,857.59
5. Step 5: Solve for x
   x = 1,960,857.59/1,603.80
6. Step 6: Final answer
   x = 1,222.63