Finding the Fourth Proportional to 1,076.94, 1,485.71 and 678.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.94 : 1,485.71 = 678.45 : x
2. Step 2: Convert to fraction form
   1,076.94/1,485.71 = 678.45/x
3. Step 3: Cross multiply
   1,076.94x = 1,485.71 × 678.45
4. Step 4: Simplify right side
   1,076.94x = 1,007,979.95
5. Step 5: Solve for x
   x = 1,007,979.95/1,076.94
6. Step 6: Final answer
   x = 935.97