Finding the Fourth Proportional to 1,405.71, 1,939.41 and 908.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.71 : 1,939.41 = 908.98 : x
2. Step 2: Convert to fraction form
   1,405.71/1,939.41 = 908.98/x
3. Step 3: Cross multiply
   1,405.71x = 1,939.41 × 908.98
4. Step 4: Simplify right side
   1,405.71x = 1,762,880.05
5. Step 5: Solve for x
   x = 1,762,880.05/1,405.71
6. Step 6: Final answer
   x = 1,254.09