Finding the Fourth Proportional to 2,815.19, 4,216.43 and 1,355.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.19 : 4,216.43 = 1,355.43 : x
2. Step 2: Convert to fraction form
   2,815.19/4,216.43 = 1,355.43/x
3. Step 3: Cross multiply
   2,815.19x = 4,216.43 × 1,355.43
4. Step 4: Simplify right side
   2,815.19x = 5,715,079.10
5. Step 5: Solve for x
   x = 5,715,079.10/2,815.19
6. Step 6: Final answer
   x = 2,030.09