Finding the Fourth Proportional to 1,238.32, 1,708.92 and 678.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.32 : 1,708.92 = 678.82 : x
2. Step 2: Convert to fraction form
   1,238.32/1,708.92 = 678.82/x
3. Step 3: Cross multiply
   1,238.32x = 1,708.92 × 678.82
4. Step 4: Simplify right side
   1,238.32x = 1,160,049.07
5. Step 5: Solve for x
   x = 1,160,049.07/1,238.32
6. Step 6: Final answer
   x = 936.79