Finding the Fourth Proportional to 1,398.02, 1,929.38 and 808.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.02 : 1,929.38 = 808.56 : x
2. Step 2: Convert to fraction form
   1,398.02/1,929.38 = 808.56/x
3. Step 3: Cross multiply
   1,398.02x = 1,929.38 × 808.56
4. Step 4: Simplify right side
   1,398.02x = 1,560,015.45
5. Step 5: Solve for x
   x = 1,560,015.45/1,398.02
6. Step 6: Final answer
   x = 1,115.88