Finding the Fourth Proportional to 1,147.34, 1,721.34 and 454.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.34 : 1,721.34 = 454.10 : x
2. Step 2: Convert to fraction form
   1,147.34/1,721.34 = 454.10/x
3. Step 3: Cross multiply
   1,147.34x = 1,721.34 × 454.10
4. Step 4: Simplify right side
   1,147.34x = 781,660.49
5. Step 5: Solve for x
   x = 781,660.49/1,147.34
6. Step 6: Final answer
   x = 681.28