Finding the Fourth Proportional to 13,705.73, 18,913.89 and 7,418.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,705.73 : 18,913.89 = 7,418.09 : x
2. Step 2: Convert to fraction form
   13,705.73/18,913.89 = 7,418.09/x
3. Step 3: Cross multiply
   13,705.73x = 18,913.89 × 7,418.09
4. Step 4: Simplify right side
   13,705.73x = 140,304,938.27
5. Step 5: Solve for x
   x = 140,304,938.27/13,705.73
6. Step 6: Final answer
   x = 10,236.95