Finding the Fourth Proportional to 2,055.12, 2,836.40 and 1,216.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,055.12 : 2,836.40 = 1,216.10 : x
2. Step 2: Convert to fraction form
   2,055.12/2,836.40 = 1,216.10/x
3. Step 3: Cross multiply
   2,055.12x = 2,836.40 × 1,216.10
4. Step 4: Simplify right side
   2,055.12x = 3,449,325.78
5. Step 5: Solve for x
   x = 3,449,325.78/2,055.12
6. Step 6: Final answer
   x = 1,678.41