Finding the Fourth Proportional to 1,978.62, 2,966.75 and 662.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.62 : 2,966.75 = 662.05 : x
2. Step 2: Convert to fraction form
   1,978.62/2,966.75 = 662.05/x
3. Step 3: Cross multiply
   1,978.62x = 2,966.75 × 662.05
4. Step 4: Simplify right side
   1,978.62x = 1,964,151.79
5. Step 5: Solve for x
   x = 1,964,151.79/1,978.62
6. Step 6: Final answer
   x = 992.69