Finding the Fourth Proportional to 1,078.47, 1,615.59 and 712.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.47 : 1,615.59 = 712.14 : x
2. Step 2: Convert to fraction form
   1,078.47/1,615.59 = 712.14/x
3. Step 3: Cross multiply
   1,078.47x = 1,615.59 × 712.14
4. Step 4: Simplify right side
   1,078.47x = 1,150,526.26
5. Step 5: Solve for x
   x = 1,150,526.26/1,078.47
6. Step 6: Final answer
   x = 1,066.81