Finding the Fourth Proportional to 15,112.89, 20,855.37 and 8,398.34

Step by Step Solution

1. Step 1: Write the proportion equation
   15,112.89 : 20,855.37 = 8,398.34 : x
2. Step 2: Convert to fraction form
   15,112.89/20,855.37 = 8,398.34/x
3. Step 3: Cross multiply
   15,112.89x = 20,855.37 × 8,398.34
4. Step 4: Simplify right side
   15,112.89x = 175,150,446.09
5. Step 5: Solve for x
   x = 175,150,446.09/15,112.89
6. Step 6: Final answer
   x = 11,589.48