Finding the Fourth Proportional to 1,339.68, 1,849.50 and 920.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.68 : 1,849.50 = 920.28 : x
2. Step 2: Convert to fraction form
   1,339.68/1,849.50 = 920.28/x
3. Step 3: Cross multiply
   1,339.68x = 1,849.50 × 920.28
4. Step 4: Simplify right side
   1,339.68x = 1,702,057.86
5. Step 5: Solve for x
   x = 1,702,057.86/1,339.68
6. Step 6: Final answer
   x = 1,270.50