Finding the Fourth Proportional to 10,487, 15,723.20 and 3,911.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,487 : 15,723.20 = 3,911.42 : x
2. Step 2: Convert to fraction form
   10,487/15,723.20 = 3,911.42/x
3. Step 3: Cross multiply
   10,487x = 15,723.20 × 3,911.42
4. Step 4: Simplify right side
   10,487x = 61,500,038.94
5. Step 5: Solve for x
   x = 61,500,038.94/10,487
6. Step 6: Final answer
   x = 5,864.41