Finding the Fourth Proportional to 1,085.11, 1,497.57 and 712.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.11 : 1,497.57 = 712.39 : x
2. Step 2: Convert to fraction form
   1,085.11/1,497.57 = 712.39/x
3. Step 3: Cross multiply
   1,085.11x = 1,497.57 × 712.39
4. Step 4: Simplify right side
   1,085.11x = 1,066,853.89
5. Step 5: Solve for x
   x = 1,066,853.89/1,085.11
6. Step 6: Final answer
   x = 983.18