Finding the Fourth Proportional to 1,238.01, 1,708.38 and 678.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.01 : 1,708.38 = 678.37 : x
2. Step 2: Convert to fraction form
   1,238.01/1,708.38 = 678.37/x
3. Step 3: Cross multiply
   1,238.01x = 1,708.38 × 678.37
4. Step 4: Simplify right side
   1,238.01x = 1,158,905.20
5. Step 5: Solve for x
   x = 1,158,905.20/1,238.01
6. Step 6: Final answer
   x = 936.10