Finding the Fourth Proportional to 1,978.32, 2,965.56 and 679.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.32 : 2,965.56 = 679.44 : x
2. Step 2: Convert to fraction form
   1,978.32/2,965.56 = 679.44/x
3. Step 3: Cross multiply
   1,978.32x = 2,965.56 × 679.44
4. Step 4: Simplify right side
   1,978.32x = 2,014,920.09
5. Step 5: Solve for x
   x = 2,014,920.09/1,978.32
6. Step 6: Final answer
   x = 1,018.50