Finding the Fourth Proportional to 1,398.86, 1,930.22 and 902.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.86 : 1,930.22 = 902.18 : x
2. Step 2: Convert to fraction form
   1,398.86/1,930.22 = 902.18/x
3. Step 3: Cross multiply
   1,398.86x = 1,930.22 × 902.18
4. Step 4: Simplify right side
   1,398.86x = 1,741,391.72
5. Step 5: Solve for x
   x = 1,741,391.72/1,398.86
6. Step 6: Final answer
   x = 1,244.87