Finding the Fourth Proportional to 2,679.78, 3,697.55 and 1,560.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.78 : 3,697.55 = 1,560.87 : x
2. Step 2: Convert to fraction form
   2,679.78/3,697.55 = 1,560.87/x
3. Step 3: Cross multiply
   2,679.78x = 3,697.55 × 1,560.87
4. Step 4: Simplify right side
   2,679.78x = 5,771,392.92
5. Step 5: Solve for x
   x = 5,771,392.92/2,679.78
6. Step 6: Final answer
   x = 2,153.68