Finding the Fourth Proportional to 1,405.56, 1,940.72 and 908.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.56 : 1,940.72 = 908.50 : x
2. Step 2: Convert to fraction form
   1,405.56/1,940.72 = 908.50/x
3. Step 3: Cross multiply
   1,405.56x = 1,940.72 × 908.50
4. Step 4: Simplify right side
   1,405.56x = 1,763,144.12
5. Step 5: Solve for x
   x = 1,763,144.12/1,405.56
6. Step 6: Final answer
   x = 1,254.41