Finding the Fourth Proportional to 1,772.72, 2,446.37 and 986.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,772.72 : 2,446.37 = 986.78 : x
2. Step 2: Convert to fraction form
   1,772.72/2,446.37 = 986.78/x
3. Step 3: Cross multiply
   1,772.72x = 2,446.37 × 986.78
4. Step 4: Simplify right side
   1,772.72x = 2,414,033.87
5. Step 5: Solve for x
   x = 2,414,033.87/1,772.72
6. Step 6: Final answer
   x = 1,361.77