Finding the Fourth Proportional to 11,145.62, 16,637.37 and 10,640.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,145.62 : 16,637.37 = 10,640.18 : x
2. Step 2: Convert to fraction form
   11,145.62/16,637.37 = 10,640.18/x
3. Step 3: Cross multiply
   11,145.62x = 16,637.37 × 10,640.18
4. Step 4: Simplify right side
   11,145.62x = 177,024,558.33
5. Step 5: Solve for x
   x = 177,024,558.33/11,145.62
6. Step 6: Final answer
   x = 15,882.88