Finding the Fourth Proportional to 2,602.27, 3,902.79 and 870.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.27 : 3,902.79 = 870.89 : x
2. Step 2: Convert to fraction form
   2,602.27/3,902.79 = 870.89/x
3. Step 3: Cross multiply
   2,602.27x = 3,902.79 × 870.89
4. Step 4: Simplify right side
   2,602.27x = 3,398,900.78
5. Step 5: Solve for x
   x = 3,398,900.78/2,602.27
6. Step 6: Final answer
   x = 1,306.13