Finding the Fourth Proportional to 12,321.72, 18,473.13 and 3,996.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,321.72 : 18,473.13 = 3,996.69 : x
2. Step 2: Convert to fraction form
   12,321.72/18,473.13 = 3,996.69/x
3. Step 3: Cross multiply
   12,321.72x = 18,473.13 × 3,996.69
4. Step 4: Simplify right side
   12,321.72x = 73,831,373.94
5. Step 5: Solve for x
   x = 73,831,373.94/12,321.72
6. Step 6: Final answer
   x = 5,991.97