Finding the Fourth Proportional to 2,603.52, 3,902.40 and 870.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.52 : 3,902.40 = 870.84 : x
2. Step 2: Convert to fraction form
   2,603.52/3,902.40 = 870.84/x
3. Step 3: Cross multiply
   2,603.52x = 3,902.40 × 870.84
4. Step 4: Simplify right side
   2,603.52x = 3,398,366.02
5. Step 5: Solve for x
   x = 3,398,366.02/2,603.52
6. Step 6: Final answer
   x = 1,305.30