Finding the Fourth Proportional to 1,978.71, 2,967.06 and 661.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.71 : 2,967.06 = 661.99 : x
2. Step 2: Convert to fraction form
   1,978.71/2,967.06 = 661.99/x
3. Step 3: Cross multiply
   1,978.71x = 2,967.06 × 661.99
4. Step 4: Simplify right side
   1,978.71x = 1,964,164.05
5. Step 5: Solve for x
   x = 1,964,164.05/1,978.71
6. Step 6: Final answer
   x = 992.65