Finding the Fourth Proportional to 13,396.50, 18,487.17 and 7,429.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,396.50 : 18,487.17 = 7,429.10 : x
2. Step 2: Convert to fraction form
   13,396.50/18,487.17 = 7,429.10/x
3. Step 3: Cross multiply
   13,396.50x = 18,487.17 × 7,429.10
4. Step 4: Simplify right side
   13,396.50x = 137,342,942.21
5. Step 5: Solve for x
   x = 137,342,942.21/13,396.50
6. Step 6: Final answer
   x = 10,252.15