Finding the Fourth Proportional to 10,983.34, 15,083.89 and 9,211.87

Step by Step Solution

1. Step 1: Write the proportion equation
   10,983.34 : 15,083.89 = 9,211.87 : x
2. Step 2: Convert to fraction form
   10,983.34/15,083.89 = 9,211.87/x
3. Step 3: Cross multiply
   10,983.34x = 15,083.89 × 9,211.87
4. Step 4: Simplify right side
   10,983.34x = 138,950,758.35
5. Step 5: Solve for x
   x = 138,950,758.35/10,983.34
6. Step 6: Final answer
   x = 12,651.05