Finding the Fourth Proportional to 1,298.38, 1,792.15 and 905.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.38 : 1,792.15 = 905.53 : x
2. Step 2: Convert to fraction form
   1,298.38/1,792.15 = 905.53/x
3. Step 3: Cross multiply
   1,298.38x = 1,792.15 × 905.53
4. Step 4: Simplify right side
   1,298.38x = 1,622,851.20
5. Step 5: Solve for x
   x = 1,622,851.20/1,298.38
6. Step 6: Final answer
   x = 1,249.90