Finding the Fourth Proportional to 1,978.29, 2,968.65 and 680.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.29 : 2,968.65 = 680.67 : x
2. Step 2: Convert to fraction form
   1,978.29/2,968.65 = 680.67/x
3. Step 3: Cross multiply
   1,978.29x = 2,968.65 × 680.67
4. Step 4: Simplify right side
   1,978.29x = 2,020,671.00
5. Step 5: Solve for x
   x = 2,020,671.00/1,978.29
6. Step 6: Final answer
   x = 1,021.42