Finding the Fourth Proportional to 2,229.80, 3,345.89 and 1,678.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,229.80 : 3,345.89 = 1,678.19 : x
2. Step 2: Convert to fraction form
   2,229.80/3,345.89 = 1,678.19/x
3. Step 3: Cross multiply
   2,229.80x = 3,345.89 × 1,678.19
4. Step 4: Simplify right side
   2,229.80x = 5,615,014.02
5. Step 5: Solve for x
   x = 5,615,014.02/2,229.80
6. Step 6: Final answer
   x = 2,518.17