Finding the Fourth Proportional to 10,887.12, 16,327.44 and 3,960

Step by Step Solution

1. Step 1: Write the proportion equation
   10,887.12 : 16,327.44 = 3,960 : x
2. Step 2: Convert to fraction form
   10,887.12/16,327.44 = 3,960/x
3. Step 3: Cross multiply
   10,887.12x = 16,327.44 × 3,960
4. Step 4: Simplify right side
   10,887.12x = 64,656,662.40
5. Step 5: Solve for x
   x = 64,656,662.40/10,887.12
6. Step 6: Final answer
   x = 5,938.82