Finding the Fourth Proportional to 2,216.90, 3,320.31 and 1,776.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.90 : 3,320.31 = 1,776.62 : x
2. Step 2: Convert to fraction form
   2,216.90/3,320.31 = 1,776.62/x
3. Step 3: Cross multiply
   2,216.90x = 3,320.31 × 1,776.62
4. Step 4: Simplify right side
   2,216.90x = 5,898,929.15
5. Step 5: Solve for x
   x = 5,898,929.15/2,216.90
6. Step 6: Final answer
   x = 2,660.89