Finding the Fourth Proportional to 1,607.05, 2,217.78 and 908.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.05 : 2,217.78 = 908.47 : x
2. Step 2: Convert to fraction form
   1,607.05/2,217.78 = 908.47/x
3. Step 3: Cross multiply
   1,607.05x = 2,217.78 × 908.47
4. Step 4: Simplify right side
   1,607.05x = 2,014,786.60
5. Step 5: Solve for x
   x = 2,014,786.60/1,607.05
6. Step 6: Final answer
   x = 1,253.72