Finding the Fourth Proportional to 1,150.72, 1,726.50 and 420.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.72 : 1,726.50 = 420.37 : x
2. Step 2: Convert to fraction form
   1,150.72/1,726.50 = 420.37/x
3. Step 3: Cross multiply
   1,150.72x = 1,726.50 × 420.37
4. Step 4: Simplify right side
   1,150.72x = 725,768.81
5. Step 5: Solve for x
   x = 725,768.81/1,150.72
6. Step 6: Final answer
   x = 630.71