Finding the Fourth Proportional to 1,544.72, 2,315.76 and 678.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,544.72 : 2,315.76 = 678.36 : x
2. Step 2: Convert to fraction form
   1,544.72/2,315.76 = 678.36/x
3. Step 3: Cross multiply
   1,544.72x = 2,315.76 × 678.36
4. Step 4: Simplify right side
   1,544.72x = 1,570,918.95
5. Step 5: Solve for x
   x = 1,570,918.95/1,544.72
6. Step 6: Final answer
   x = 1,016.96