Finding the Fourth Proportional to 1,978.27, 2,967.59 and 661.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.27 : 2,967.59 = 661.97 : x
2. Step 2: Convert to fraction form
   1,978.27/2,967.59 = 661.97/x
3. Step 3: Cross multiply
   1,978.27x = 2,967.59 × 661.97
4. Step 4: Simplify right side
   1,978.27x = 1,964,460.90
5. Step 5: Solve for x
   x = 1,964,460.90/1,978.27
6. Step 6: Final answer
   x = 993.02