Finding the Fourth Proportional to 13,399.98, 18,492.57 and 7,431.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,399.98 : 18,492.57 = 7,431.25 : x
2. Step 2: Convert to fraction form
   13,399.98/18,492.57 = 7,431.25/x
3. Step 3: Cross multiply
   13,399.98x = 18,492.57 × 7,431.25
4. Step 4: Simplify right side
   13,399.98x = 137,422,864.58
5. Step 5: Solve for x
   x = 137,422,864.58/13,399.98
6. Step 6: Final answer
   x = 10,255.45