Finding the Fourth Proportional to 2,215.20, 3,056.55 and 1,331.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.20 : 3,056.55 = 1,331.10 : x
2. Step 2: Convert to fraction form
   2,215.20/3,056.55 = 1,331.10/x
3. Step 3: Cross multiply
   2,215.20x = 3,056.55 × 1,331.10
4. Step 4: Simplify right side
   2,215.20x = 4,068,573.71
5. Step 5: Solve for x
   x = 4,068,573.71/2,215.20
6. Step 6: Final answer
   x = 1,836.66