Finding the Fourth Proportional to 2,660.02, 3,989.76 and 712.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.02 : 3,989.76 = 712.42 : x
2. Step 2: Convert to fraction form
   2,660.02/3,989.76 = 712.42/x
3. Step 3: Cross multiply
   2,660.02x = 3,989.76 × 712.42
4. Step 4: Simplify right side
   2,660.02x = 2,842,384.82
5. Step 5: Solve for x
   x = 2,842,384.82/2,660.02
6. Step 6: Final answer
   x = 1,068.56