Finding the Fourth Proportional to 1,271.80, 1,904.82 and 757.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.80 : 1,904.82 = 757.72 : x
2. Step 2: Convert to fraction form
   1,271.80/1,904.82 = 757.72/x
3. Step 3: Cross multiply
   1,271.80x = 1,904.82 × 757.72
4. Step 4: Simplify right side
   1,271.80x = 1,443,320.21
5. Step 5: Solve for x
   x = 1,443,320.21/1,271.80
6. Step 6: Final answer
   x = 1,134.86