Finding the Fourth Proportional to 11,815.76, 17,730.72 and 10,605.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,815.76 : 17,730.72 = 10,605.62 : x
2. Step 2: Convert to fraction form
   11,815.76/17,730.72 = 10,605.62/x
3. Step 3: Cross multiply
   11,815.76x = 17,730.72 × 10,605.62
4. Step 4: Simplify right side
   11,815.76x = 188,045,189.99
5. Step 5: Solve for x
   x = 188,045,189.99/11,815.76
6. Step 6: Final answer
   x = 15,914.78