Finding the Fourth Proportional to 1,039.48, 1,560.42 and 712.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.48 : 1,560.42 = 712.54 : x
2. Step 2: Convert to fraction form
   1,039.48/1,560.42 = 712.54/x
3. Step 3: Cross multiply
   1,039.48x = 1,560.42 × 712.54
4. Step 4: Simplify right side
   1,039.48x = 1,111,861.67
5. Step 5: Solve for x
   x = 1,111,861.67/1,039.48
6. Step 6: Final answer
   x = 1,069.63