Finding the Fourth Proportional to 1,238.91, 1,709.82 and 714.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.91 : 1,709.82 = 714.98 : x
2. Step 2: Convert to fraction form
   1,238.91/1,709.82 = 714.98/x
3. Step 3: Cross multiply
   1,238.91x = 1,709.82 × 714.98
4. Step 4: Simplify right side
   1,238.91x = 1,222,478.55
5. Step 5: Solve for x
   x = 1,222,478.55/1,238.91
6. Step 6: Final answer
   x = 986.74