Finding the Fourth Proportional to 2,680.79, 3,699.32 and 1,561.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.79 : 3,699.32 = 1,561.68 : x
2. Step 2: Convert to fraction form
   2,680.79/3,699.32 = 1,561.68/x
3. Step 3: Cross multiply
   2,680.79x = 3,699.32 × 1,561.68
4. Step 4: Simplify right side
   2,680.79x = 5,777,146.25
5. Step 5: Solve for x
   x = 5,777,146.25/2,680.79
6. Step 6: Final answer
   x = 2,155.02