Finding the Fourth Proportional to 10,519.02, 15,781.59 and 3,945.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,519.02 : 15,781.59 = 3,945.72 : x
2. Step 2: Convert to fraction form
   10,519.02/15,781.59 = 3,945.72/x
3. Step 3: Cross multiply
   10,519.02x = 15,781.59 × 3,945.72
4. Step 4: Simplify right side
   10,519.02x = 62,269,735.29
5. Step 5: Solve for x
   x = 62,269,735.29/10,519.02
6. Step 6: Final answer
   x = 5,919.73