Finding the Fourth Proportional to 1,607.12, 2,217.82 and 908.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.12 : 2,217.82 = 908.50 : x
2. Step 2: Convert to fraction form
   1,607.12/2,217.82 = 908.50/x
3. Step 3: Cross multiply
   1,607.12x = 2,217.82 × 908.50
4. Step 4: Simplify right side
   1,607.12x = 2,014,878.38
5. Step 5: Solve for x
   x = 2,014,878.38/1,607.12
6. Step 6: Final answer
   x = 1,253.72