Finding the Fourth Proportional to 2,679.60, 3,697.83 and 1,560.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.60 : 3,697.83 = 1,560.78 : x
2. Step 2: Convert to fraction form
   2,679.60/3,697.83 = 1,560.78/x
3. Step 3: Cross multiply
   2,679.60x = 3,697.83 × 1,560.78
4. Step 4: Simplify right side
   2,679.60x = 5,771,499.11
5. Step 5: Solve for x
   x = 5,771,499.11/2,679.60
6. Step 6: Final answer
   x = 2,153.87