Finding the Fourth Proportional to 1,150.94, 1,587.78 and 678.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.94 : 1,587.78 = 678.71 : x
2. Step 2: Convert to fraction form
   1,150.94/1,587.78 = 678.71/x
3. Step 3: Cross multiply
   1,150.94x = 1,587.78 × 678.71
4. Step 4: Simplify right side
   1,150.94x = 1,077,634.22
5. Step 5: Solve for x
   x = 1,077,634.22/1,150.94
6. Step 6: Final answer
   x = 936.31