Finding the Fourth Proportional to 1,380.72, 1,906.09 and 908.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.72 : 1,906.09 = 908.93 : x
2. Step 2: Convert to fraction form
   1,380.72/1,906.09 = 908.93/x
3. Step 3: Cross multiply
   1,380.72x = 1,906.09 × 908.93
4. Step 4: Simplify right side
   1,380.72x = 1,732,490.58
5. Step 5: Solve for x
   x = 1,732,490.58/1,380.72
6. Step 6: Final answer
   x = 1,254.77