Finding the Fourth Proportional to 13,389.82, 18,477.76 and 7,421.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,389.82 : 18,477.76 = 7,421.36 : x
2. Step 2: Convert to fraction form
   13,389.82/18,477.76 = 7,421.36/x
3. Step 3: Cross multiply
   13,389.82x = 18,477.76 × 7,421.36
4. Step 4: Simplify right side
   13,389.82x = 137,130,016.56
5. Step 5: Solve for x
   x = 137,130,016.56/13,389.82
6. Step 6: Final answer
   x = 10,241.37