Finding the Fourth Proportional to 1,277.55, 1,763.10 and 710.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,277.55 : 1,763.10 = 710.42 : x
2. Step 2: Convert to fraction form
   1,277.55/1,763.10 = 710.42/x
3. Step 3: Cross multiply
   1,277.55x = 1,763.10 × 710.42
4. Step 4: Simplify right side
   1,277.55x = 1,252,532.69
5. Step 5: Solve for x
   x = 1,252,532.69/1,277.55
6. Step 6: Final answer
   x = 980.42