Finding the Fourth Proportional to 13,388.22, 18,476.60 and 7,724.03

Step by Step Solution

1. Step 1: Write the proportion equation
   13,388.22 : 18,476.60 = 7,724.03 : x
2. Step 2: Convert to fraction form
   13,388.22/18,476.60 = 7,724.03/x
3. Step 3: Cross multiply
   13,388.22x = 18,476.60 × 7,724.03
4. Step 4: Simplify right side
   13,388.22x = 142,713,681.69
5. Step 5: Solve for x
   x = 142,713,681.69/13,388.22
6. Step 6: Final answer
   x = 10,659.65