Finding the Fourth Proportional to 1,236.89, 1,706.82 and 712.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,236.89 : 1,706.82 = 712.88 : x
2. Step 2: Convert to fraction form
   1,236.89/1,706.82 = 712.88/x
3. Step 3: Cross multiply
   1,236.89x = 1,706.82 × 712.88
4. Step 4: Simplify right side
   1,236.89x = 1,216,749.31
5. Step 5: Solve for x
   x = 1,216,749.31/1,236.89
6. Step 6: Final answer
   x = 983.72