Finding the Fourth Proportional to 13,404.61, 18,500.57 and 7,438.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,404.61 : 18,500.57 = 7,438.20 : x
2. Step 2: Convert to fraction form
   13,404.61/18,500.57 = 7,438.20/x
3. Step 3: Cross multiply
   13,404.61x = 18,500.57 × 7,438.20
4. Step 4: Simplify right side
   13,404.61x = 137,610,861.10
5. Step 5: Solve for x
   x = 137,610,861.10/13,404.61
6. Step 6: Final answer
   x = 10,265.94