Finding the Fourth Proportional to 2,410.56, 3,615.42 and 678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,410.56 : 3,615.42 = 678.72 : x
2. Step 2: Convert to fraction form
   2,410.56/3,615.42 = 678.72/x
3. Step 3: Cross multiply
   2,410.56x = 3,615.42 × 678.72
4. Step 4: Simplify right side
   2,410.56x = 2,453,857.86
5. Step 5: Solve for x
   x = 2,453,857.86/2,410.56
6. Step 6: Final answer
   x = 1,017.96