Finding the Fourth Proportional to 1,377.88, 1,900.97 and 906.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.88 : 1,900.97 = 906.03 : x
2. Step 2: Convert to fraction form
   1,377.88/1,900.97 = 906.03/x
3. Step 3: Cross multiply
   1,377.88x = 1,900.97 × 906.03
4. Step 4: Simplify right side
   1,377.88x = 1,722,335.85
5. Step 5: Solve for x
   x = 1,722,335.85/1,377.88
6. Step 6: Final answer
   x = 1,249.99