Finding the Fourth Proportional to 1,377.54, 1,901.31 and 905.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.54 : 1,901.31 = 905.48 : x
2. Step 2: Convert to fraction form
   1,377.54/1,901.31 = 905.48/x
3. Step 3: Cross multiply
   1,377.54x = 1,901.31 × 905.48
4. Step 4: Simplify right side
   1,377.54x = 1,721,604.43
5. Step 5: Solve for x
   x = 1,721,604.43/1,377.54
6. Step 6: Final answer
   x = 1,249.76