Finding the Fourth Proportional to 2,162.18, 2,983.58 and 1,217.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.18 : 2,983.58 = 1,217.76 : x
2. Step 2: Convert to fraction form
   2,162.18/2,983.58 = 1,217.76/x
3. Step 3: Cross multiply
   2,162.18x = 2,983.58 × 1,217.76
4. Step 4: Simplify right side
   2,162.18x = 3,633,284.38
5. Step 5: Solve for x
   x = 3,633,284.38/2,162.18
6. Step 6: Final answer
   x = 1,680.38