Finding the Fourth Proportional to 1,150.05, 1,726.06 and 457.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.05 : 1,726.06 = 457.21 : x
2. Step 2: Convert to fraction form
   1,150.05/1,726.06 = 457.21/x
3. Step 3: Cross multiply
   1,150.05x = 1,726.06 × 457.21
4. Step 4: Simplify right side
   1,150.05x = 789,172.07
5. Step 5: Solve for x
   x = 789,172.07/1,150.05
6. Step 6: Final answer
   x = 686.20