Finding the Fourth Proportional to 1,271.34, 1,753.20 and 921.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.34 : 1,753.20 = 921.42 : x
2. Step 2: Convert to fraction form
   1,271.34/1,753.20 = 921.42/x
3. Step 3: Cross multiply
   1,271.34x = 1,753.20 × 921.42
4. Step 4: Simplify right side
   1,271.34x = 1,615,433.54
5. Step 5: Solve for x
   x = 1,615,433.54/1,271.34
6. Step 6: Final answer
   x = 1,270.65