Finding the Fourth Proportional to 2,143.15, 3,210.48 and 1,678.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.15 : 3,210.48 = 1,678.77 : x
2. Step 2: Convert to fraction form
   2,143.15/3,210.48 = 1,678.77/x
3. Step 3: Cross multiply
   2,143.15x = 3,210.48 × 1,678.77
4. Step 4: Simplify right side
   2,143.15x = 5,389,657.51
5. Step 5: Solve for x
   x = 5,389,657.51/2,143.15
6. Step 6: Final answer
   x = 2,514.83