Finding the Fourth Proportional to 2,050.78, 3,076.14 and 664.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,050.78 : 3,076.14 = 664.15 : x
2. Step 2: Convert to fraction form
   2,050.78/3,076.14 = 664.15/x
3. Step 3: Cross multiply
   2,050.78x = 3,076.14 × 664.15
4. Step 4: Simplify right side
   2,050.78x = 2,043,018.38
5. Step 5: Solve for x
   x = 2,043,018.38/2,050.78
6. Step 6: Final answer
   x = 996.22