Finding the Fourth Proportional to 1,271.99, 1,755.50 and 774.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.99 : 1,755.50 = 774.69 : x
2. Step 2: Convert to fraction form
   1,271.99/1,755.50 = 774.69/x
3. Step 3: Cross multiply
   1,271.99x = 1,755.50 × 774.69
4. Step 4: Simplify right side
   1,271.99x = 1,359,964.42
5. Step 5: Solve for x
   x = 1,359,964.42/1,271.99
6. Step 6: Final answer
   x = 1,069.17