Finding the Fourth Proportional to 1,281.55, 1,921.20 and 760.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.55 : 1,921.20 = 760.27 : x
2. Step 2: Convert to fraction form
   1,281.55/1,921.20 = 760.27/x
3. Step 3: Cross multiply
   1,281.55x = 1,921.20 × 760.27
4. Step 4: Simplify right side
   1,281.55x = 1,460,630.72
5. Step 5: Solve for x
   x = 1,460,630.72/1,281.55
6. Step 6: Final answer
   x = 1,139.74