Finding the Fourth Proportional to 2,621.69, 3,617.51 and 1,678.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.69 : 3,617.51 = 1,678.31 : x
2. Step 2: Convert to fraction form
   2,621.69/3,617.51 = 1,678.31/x
3. Step 3: Cross multiply
   2,621.69x = 3,617.51 × 1,678.31
4. Step 4: Simplify right side
   2,621.69x = 6,071,276.73
5. Step 5: Solve for x
   x = 6,071,276.73/2,621.69
6. Step 6: Final answer
   x = 2,315.79