Finding the Fourth Proportional to 1,238.01, 1,708.49 and 678.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.01 : 1,708.49 = 678.50 : x
2. Step 2: Convert to fraction form
   1,238.01/1,708.49 = 678.50/x
3. Step 3: Cross multiply
   1,238.01x = 1,708.49 × 678.50
4. Step 4: Simplify right side
   1,238.01x = 1,159,214.83
5. Step 5: Solve for x
   x = 1,159,214.83/1,238.01
6. Step 6: Final answer
   x = 936.35