Finding the Fourth Proportional to 13,689.05, 18,890.82 and 7,401.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,689.05 : 18,890.82 = 7,401.42 : x
2. Step 2: Convert to fraction form
   13,689.05/18,890.82 = 7,401.42/x
3. Step 3: Cross multiply
   13,689.05x = 18,890.82 × 7,401.42
4. Step 4: Simplify right side
   13,689.05x = 139,818,892.96
5. Step 5: Solve for x
   x = 139,818,892.96/13,689.05
6. Step 6: Final answer
   x = 10,213.93