Finding the Fourth Proportional to 1,603.21, 2,211.82 and 939.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.21 : 2,211.82 = 939.82 : x
2. Step 2: Convert to fraction form
   1,603.21/2,211.82 = 939.82/x
3. Step 3: Cross multiply
   1,603.21x = 2,211.82 × 939.82
4. Step 4: Simplify right side
   1,603.21x = 2,078,712.67
5. Step 5: Solve for x
   x = 2,078,712.67/1,603.21
6. Step 6: Final answer
   x = 1,296.59