Finding the Fourth Proportional to 11,211.99, 16,685.61 and 10,838.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,211.99 : 16,685.61 = 10,838.31 : x
2. Step 2: Convert to fraction form
   11,211.99/16,685.61 = 10,838.31/x
3. Step 3: Cross multiply
   11,211.99x = 16,685.61 × 10,838.31
4. Step 4: Simplify right side
   11,211.99x = 180,843,813.72
5. Step 5: Solve for x
   x = 180,843,813.72/11,211.99
6. Step 6: Final answer
   x = 16,129.50