Finding the Fourth Proportional to 2,405.70, 3,608.79 and 866.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.70 : 3,608.79 = 866.50 : x
2. Step 2: Convert to fraction form
   2,405.70/3,608.79 = 866.50/x
3. Step 3: Cross multiply
   2,405.70x = 3,608.79 × 866.50
4. Step 4: Simplify right side
   2,405.70x = 3,127,016.54
5. Step 5: Solve for x
   x = 3,127,016.54/2,405.70
6. Step 6: Final answer
   x = 1,299.84