Finding the Fourth Proportional to 13,629.52, 18,802.42 and 7,964.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,629.52 : 18,802.42 = 7,964.50 : x
2. Step 2: Convert to fraction form
   13,629.52/18,802.42 = 7,964.50/x
3. Step 3: Cross multiply
   13,629.52x = 18,802.42 × 7,964.50
4. Step 4: Simplify right side
   13,629.52x = 149,751,874.09
5. Step 5: Solve for x
   x = 149,751,874.09/13,629.52
6. Step 6: Final answer
   x = 10,987.32