Finding the Fourth Proportional to 1,735.52, 2,603.62 and 639.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,735.52 : 2,603.62 = 639.89 : x
2. Step 2: Convert to fraction form
   1,735.52/2,603.62 = 639.89/x
3. Step 3: Cross multiply
   1,735.52x = 2,603.62 × 639.89
4. Step 4: Simplify right side
   1,735.52x = 1,666,017.38
5. Step 5: Solve for x
   x = 1,666,017.38/1,735.52
6. Step 6: Final answer
   x = 959.96