Finding the Fourth Proportional to 11,685.50, 17,443.52 and 10,818.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,685.50 : 17,443.52 = 10,818.30 : x
2. Step 2: Convert to fraction form
   11,685.50/17,443.52 = 10,818.30/x
3. Step 3: Cross multiply
   11,685.50x = 17,443.52 × 10,818.30
4. Step 4: Simplify right side
   11,685.50x = 188,709,232.42
5. Step 5: Solve for x
   x = 188,709,232.42/11,685.50
6. Step 6: Final answer
   x = 16,149.01