Finding the Fourth Proportional to 1,238.67, 1,709.46 and 714.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.67 : 1,709.46 = 714.72 : x
2. Step 2: Convert to fraction form
   1,238.67/1,709.46 = 714.72/x
3. Step 3: Cross multiply
   1,238.67x = 1,709.46 × 714.72
4. Step 4: Simplify right side
   1,238.67x = 1,221,785.25
5. Step 5: Solve for x
   x = 1,221,785.25/1,238.67
6. Step 6: Final answer
   x = 986.37