Finding the Fourth Proportional to 13,401.60, 18,492.84 and 7,431.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,401.60 : 18,492.84 = 7,431.72 : x
2. Step 2: Convert to fraction form
   13,401.60/18,492.84 = 7,431.72/x
3. Step 3: Cross multiply
   13,401.60x = 18,492.84 × 7,431.72
4. Step 4: Simplify right side
   13,401.60x = 137,433,608.88
5. Step 5: Solve for x
   x = 137,433,608.88/13,401.60
6. Step 6: Final answer
   x = 10,255.01