Finding the Fourth Proportional to 3,122.56, 4,678.65 and 2,196.17

Step by Step Solution

1. Step 1: Write the proportion equation
   3,122.56 : 4,678.65 = 2,196.17 : x
2. Step 2: Convert to fraction form
   3,122.56/4,678.65 = 2,196.17/x
3. Step 3: Cross multiply
   3,122.56x = 4,678.65 × 2,196.17
4. Step 4: Simplify right side
   3,122.56x = 10,275,131.33
5. Step 5: Solve for x
   x = 10,275,131.33/3,122.56
6. Step 6: Final answer
   x = 3,290.61