Finding the Fourth Proportional to 2,012.16, 3,017.60 and 712.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.16 : 3,017.60 = 712.96 : x
2. Step 2: Convert to fraction form
   2,012.16/3,017.60 = 712.96/x
3. Step 3: Cross multiply
   2,012.16x = 3,017.60 × 712.96
4. Step 4: Simplify right side
   2,012.16x = 2,151,428.10
5. Step 5: Solve for x
   x = 2,151,428.10/2,012.16
6. Step 6: Final answer
   x = 1,069.21