Finding the Fourth Proportional to 1,238.86, 1,709.88 and 714.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.86 : 1,709.88 = 714.82 : x
2. Step 2: Convert to fraction form
   1,238.86/1,709.88 = 714.82/x
3. Step 3: Cross multiply
   1,238.86x = 1,709.88 × 714.82
4. Step 4: Simplify right side
   1,238.86x = 1,222,256.42
5. Step 5: Solve for x
   x = 1,222,256.42/1,238.86
6. Step 6: Final answer
   x = 986.60