Finding the Fourth Proportional to 2,165.69, 3,246.71 and 866.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.69 : 3,246.71 = 866.45 : x
2. Step 2: Convert to fraction form
   2,165.69/3,246.71 = 866.45/x
3. Step 3: Cross multiply
   2,165.69x = 3,246.71 × 866.45
4. Step 4: Simplify right side
   2,165.69x = 2,813,091.31
5. Step 5: Solve for x
   x = 2,813,091.31/2,165.69
6. Step 6: Final answer
   x = 1,298.94