Finding the Fourth Proportional to 10,911.72, 16,357.42 and 3,981

Step by Step Solution

1. Step 1: Write the proportion equation
   10,911.72 : 16,357.42 = 3,981 : x
2. Step 2: Convert to fraction form
   10,911.72/16,357.42 = 3,981/x
3. Step 3: Cross multiply
   10,911.72x = 16,357.42 × 3,981
4. Step 4: Simplify right side
   10,911.72x = 65,118,889.02
5. Step 5: Solve for x
   x = 65,118,889.02/10,911.72
6. Step 6: Final answer
   x = 5,967.79