Finding the Fourth Proportional to 1,405.74, 1,939.32 and 908.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.74 : 1,939.32 = 908.43 : x
2. Step 2: Convert to fraction form
   1,405.74/1,939.32 = 908.43/x
3. Step 3: Cross multiply
   1,405.74x = 1,939.32 × 908.43
4. Step 4: Simplify right side
   1,405.74x = 1,761,736.47
5. Step 5: Solve for x
   x = 1,761,736.47/1,405.74
6. Step 6: Final answer
   x = 1,253.24