Finding the Fourth Proportional to 1,398.22, 1,929.89 and 808.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.22 : 1,929.89 = 808.67 : x
2. Step 2: Convert to fraction form
   1,398.22/1,929.89 = 808.67/x
3. Step 3: Cross multiply
   1,398.22x = 1,929.89 × 808.67
4. Step 4: Simplify right side
   1,398.22x = 1,560,644.15
5. Step 5: Solve for x
   x = 1,560,644.15/1,398.22
6. Step 6: Final answer
   x = 1,116.16