Finding the Fourth Proportional to 1,760.46, 2,638.56 and 720.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,760.46 : 2,638.56 = 720.42 : x
2. Step 2: Convert to fraction form
   1,760.46/2,638.56 = 720.42/x
3. Step 3: Cross multiply
   1,760.46x = 2,638.56 × 720.42
4. Step 4: Simplify right side
   1,760.46x = 1,900,871.40
5. Step 5: Solve for x
   x = 1,900,871.40/1,760.46
6. Step 6: Final answer
   x = 1,079.76