Finding the Fourth Proportional to 2,218.61, 3,328.95 and 902.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.61 : 3,328.95 = 902.27 : x
2. Step 2: Convert to fraction form
   2,218.61/3,328.95 = 902.27/x
3. Step 3: Cross multiply
   2,218.61x = 3,328.95 × 902.27
4. Step 4: Simplify right side
   2,218.61x = 3,003,611.72
5. Step 5: Solve for x
   x = 3,003,611.72/2,218.61
6. Step 6: Final answer
   x = 1,353.83