Finding the Fourth Proportional to 2,185.59, 3,279.70 and 869.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.59 : 3,279.70 = 869.10 : x
2. Step 2: Convert to fraction form
   2,185.59/3,279.70 = 869.10/x
3. Step 3: Cross multiply
   2,185.59x = 3,279.70 × 869.10
4. Step 4: Simplify right side
   2,185.59x = 2,850,387.27
5. Step 5: Solve for x
   x = 2,850,387.27/2,185.59
6. Step 6: Final answer
   x = 1,304.17