Finding the Fourth Proportional to 1,238.54, 1,709.16 and 714.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.54 : 1,709.16 = 714.50 : x
2. Step 2: Convert to fraction form
   1,238.54/1,709.16 = 714.50/x
3. Step 3: Cross multiply
   1,238.54x = 1,709.16 × 714.50
4. Step 4: Simplify right side
   1,238.54x = 1,221,194.82
5. Step 5: Solve for x
   x = 1,221,194.82/1,238.54
6. Step 6: Final answer
   x = 986.00