Finding the Fourth Proportional to 18,443.72, 27,672.06 and 7,913.31

Step by Step Solution

1. Step 1: Write the proportion equation
   18,443.72 : 27,672.06 = 7,913.31 : x
2. Step 2: Convert to fraction form
   18,443.72/27,672.06 = 7,913.31/x
3. Step 3: Cross multiply
   18,443.72x = 27,672.06 × 7,913.31
4. Step 4: Simplify right side
   18,443.72x = 218,977,589.12
5. Step 5: Solve for x
   x = 218,977,589.12/18,443.72
6. Step 6: Final answer
   x = 11,872.75