Finding the Fourth Proportional to 2,215.46, 3,056.90 and 1,684.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.46 : 3,056.90 = 1,684.20 : x
2. Step 2: Convert to fraction form
   2,215.46/3,056.90 = 1,684.20/x
3. Step 3: Cross multiply
   2,215.46x = 3,056.90 × 1,684.20
4. Step 4: Simplify right side
   2,215.46x = 5,148,422.56
5. Step 5: Solve for x
   x = 5,148,422.56/2,215.46
6. Step 6: Final answer
   x = 2,323.87