Finding the Fourth Proportional to 1,238.01, 1,708.41 and 678.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.01 : 1,708.41 = 678.51 : x
2. Step 2: Convert to fraction form
   1,238.01/1,708.41 = 678.51/x
3. Step 3: Cross multiply
   1,238.01x = 1,708.41 × 678.51
4. Step 4: Simplify right side
   1,238.01x = 1,159,173.27
5. Step 5: Solve for x
   x = 1,159,173.27/1,238.01
6. Step 6: Final answer
   x = 936.32