Finding the Fourth Proportional to 11,865, 16,375.97 and 7,621.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,865 : 16,375.97 = 7,621.42 : x
2. Step 2: Convert to fraction form
   11,865/16,375.97 = 7,621.42/x
3. Step 3: Cross multiply
   11,865x = 16,375.97 × 7,621.42
4. Step 4: Simplify right side
   11,865x = 124,808,145.28
5. Step 5: Solve for x
   x = 124,808,145.28/11,865
6. Step 6: Final answer
   x = 10,519.02