Finding the Fourth Proportional to 1,420.67, 1,960.81 and 923.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.67 : 1,960.81 = 923.74 : x
2. Step 2: Convert to fraction form
   1,420.67/1,960.81 = 923.74/x
3. Step 3: Cross multiply
   1,420.67x = 1,960.81 × 923.74
4. Step 4: Simplify right side
   1,420.67x = 1,811,271.42
5. Step 5: Solve for x
   x = 1,811,271.42/1,420.67
6. Step 6: Final answer
   x = 1,274.94