Finding the Fourth Proportional to 1,603.55, 2,405.67 and 679.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.55 : 2,405.67 = 679.89 : x
2. Step 2: Convert to fraction form
   1,603.55/2,405.67 = 679.89/x
3. Step 3: Cross multiply
   1,603.55x = 2,405.67 × 679.89
4. Step 4: Simplify right side
   1,603.55x = 1,635,603.18
5. Step 5: Solve for x
   x = 1,635,603.18/1,603.55
6. Step 6: Final answer
   x = 1,019.99