Finding the Fourth Proportional to 1,978.52, 2,966.79 and 661.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.52 : 2,966.79 = 661.82 : x
2. Step 2: Convert to fraction form
   1,978.52/2,966.79 = 661.82/x
3. Step 3: Cross multiply
   1,978.52x = 2,966.79 × 661.82
4. Step 4: Simplify right side
   1,978.52x = 1,963,468.61
5. Step 5: Solve for x
   x = 1,963,468.61/1,978.52
6. Step 6: Final answer
   x = 992.39