Finding the Fourth Proportional to 13,399.58, 18,491.43 and 7,431.29

Step by Step Solution

1. Step 1: Write the proportion equation
   13,399.58 : 18,491.43 = 7,431.29 : x
2. Step 2: Convert to fraction form
   13,399.58/18,491.43 = 7,431.29/x
3. Step 3: Cross multiply
   13,399.58x = 18,491.43 × 7,431.29
4. Step 4: Simplify right side
   13,399.58x = 137,415,086.39
5. Step 5: Solve for x
   x = 137,415,086.39/13,399.58
6. Step 6: Final answer
   x = 10,255.18