Finding the Fourth Proportional to 1,150.93, 1,726.27 and 420.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.93 : 1,726.27 = 420.31 : x
2. Step 2: Convert to fraction form
   1,150.93/1,726.27 = 420.31/x
3. Step 3: Cross multiply
   1,150.93x = 1,726.27 × 420.31
4. Step 4: Simplify right side
   1,150.93x = 725,568.54
5. Step 5: Solve for x
   x = 725,568.54/1,150.93
6. Step 6: Final answer
   x = 630.42