Finding the Fourth Proportional to 1,236.63, 1,706.55 and 712.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,236.63 : 1,706.55 = 712.83 : x
2. Step 2: Convert to fraction form
   1,236.63/1,706.55 = 712.83/x
3. Step 3: Cross multiply
   1,236.63x = 1,706.55 × 712.83
4. Step 4: Simplify right side
   1,236.63x = 1,216,480.04
5. Step 5: Solve for x
   x = 1,216,480.04/1,236.63
6. Step 6: Final answer
   x = 983.71