Finding the Fourth Proportional to 18,715.69, 28,085.57 and 7,469.10

Step by Step Solution

1. Step 1: Write the proportion equation
   18,715.69 : 28,085.57 = 7,469.10 : x
2. Step 2: Convert to fraction form
   18,715.69/28,085.57 = 7,469.10/x
3. Step 3: Cross multiply
   18,715.69x = 28,085.57 × 7,469.10
4. Step 4: Simplify right side
   18,715.69x = 209,773,949.56
5. Step 5: Solve for x
   x = 209,773,949.56/18,715.69
6. Step 6: Final answer
   x = 11,208.46