Finding the Fourth Proportional to 2,684.10, 4,019.67 and 1,815.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,684.10 : 4,019.67 = 1,815.78 : x
2. Step 2: Convert to fraction form
   2,684.10/4,019.67 = 1,815.78/x
3. Step 3: Cross multiply
   2,684.10x = 4,019.67 × 1,815.78
4. Step 4: Simplify right side
   2,684.10x = 7,298,836.39
5. Step 5: Solve for x
   x = 7,298,836.39/2,684.10
6. Step 6: Final answer
   x = 2,719.29