Finding the Fourth Proportional to 13,689.56, 18,891.56 and 7,401.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,689.56 : 18,891.56 = 7,401.94 : x
2. Step 2: Convert to fraction form
   13,689.56/18,891.56 = 7,401.94/x
3. Step 3: Cross multiply
   13,689.56x = 18,891.56 × 7,401.94
4. Step 4: Simplify right side
   13,689.56x = 139,834,164.90
5. Step 5: Solve for x
   x = 139,834,164.90/13,689.56
6. Step 6: Final answer
   x = 10,214.66