Finding the Fourth Proportional to 1,610.67, 2,222.78 and 902.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.67 : 2,222.78 = 902.55 : x
2. Step 2: Convert to fraction form
   1,610.67/2,222.78 = 902.55/x
3. Step 3: Cross multiply
   1,610.67x = 2,222.78 × 902.55
4. Step 4: Simplify right side
   1,610.67x = 2,006,170.09
5. Step 5: Solve for x
   x = 2,006,170.09/1,610.67
6. Step 6: Final answer
   x = 1,245.55