Finding the Fourth Proportional to 1,150.31, 1,587.79 and 678.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.31 : 1,587.79 = 678.17 : x
2. Step 2: Convert to fraction form
   1,150.31/1,587.79 = 678.17/x
3. Step 3: Cross multiply
   1,150.31x = 1,587.79 × 678.17
4. Step 4: Simplify right side
   1,150.31x = 1,076,791.54
5. Step 5: Solve for x
   x = 1,076,791.54/1,150.31
6. Step 6: Final answer
   x = 936.09