Finding the Fourth Proportional to 11,691.72, 17,517.78 and 7,065

Step by Step Solution

1. Step 1: Write the proportion equation
   11,691.72 : 17,517.78 = 7,065 : x
2. Step 2: Convert to fraction form
   11,691.72/17,517.78 = 7,065/x
3. Step 3: Cross multiply
   11,691.72x = 17,517.78 × 7,065
4. Step 4: Simplify right side
   11,691.72x = 123,763,115.70
5. Step 5: Solve for x
   x = 123,763,115.70/11,691.72
6. Step 6: Final answer
   x = 10,585.54