Finding the Fourth Proportional to 13,399.48, 18,491.33 and 7,431.70

Step by Step Solution

1. Step 1: Write the proportion equation
   13,399.48 : 18,491.33 = 7,431.70 : x
2. Step 2: Convert to fraction form
   13,399.48/18,491.33 = 7,431.70/x
3. Step 3: Cross multiply
   13,399.48x = 18,491.33 × 7,431.70
4. Step 4: Simplify right side
   13,399.48x = 137,421,887.55
5. Step 5: Solve for x
   x = 137,421,887.55/13,399.48
6. Step 6: Final answer
   x = 10,255.77