Finding the Fourth Proportional to 13,388.50, 18,475.62 and 7,420.27

Step by Step Solution

1. Step 1: Write the proportion equation
   13,388.50 : 18,475.62 = 7,420.27 : x
2. Step 2: Convert to fraction form
   13,388.50/18,475.62 = 7,420.27/x
3. Step 3: Cross multiply
   13,388.50x = 18,475.62 × 7,420.27
4. Step 4: Simplify right side
   13,388.50x = 137,093,996.44
5. Step 5: Solve for x
   x = 137,093,996.44/13,388.50
6. Step 6: Final answer
   x = 10,239.69