Finding the Fourth Proportional to 1,078.52, 1,617.10 and 712.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.52 : 1,617.10 = 712.67 : x
2. Step 2: Convert to fraction form
   1,078.52/1,617.10 = 712.67/x
3. Step 3: Cross multiply
   1,078.52x = 1,617.10 × 712.67
4. Step 4: Simplify right side
   1,078.52x = 1,152,448.79
5. Step 5: Solve for x
   x = 1,152,448.79/1,078.52
6. Step 6: Final answer
   x = 1,068.55