Finding the Fourth Proportional to 1,978.92, 2,967.12 and 680.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.92 : 2,967.12 = 680.13 : x
2. Step 2: Convert to fraction form
   1,978.92/2,967.12 = 680.13/x
3. Step 3: Cross multiply
   1,978.92x = 2,967.12 × 680.13
4. Step 4: Simplify right side
   1,978.92x = 2,018,027.33
5. Step 5: Solve for x
   x = 2,018,027.33/1,978.92
6. Step 6: Final answer
   x = 1,019.76