Finding the Fourth Proportional to 13,632.72, 18,814.31 and 7,664.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,632.72 : 18,814.31 = 7,664.94 : x
2. Step 2: Convert to fraction form
   13,632.72/18,814.31 = 7,664.94/x
3. Step 3: Cross multiply
   13,632.72x = 18,814.31 × 7,664.94
4. Step 4: Simplify right side
   13,632.72x = 144,210,518.97
5. Step 5: Solve for x
   x = 144,210,518.97/13,632.72
6. Step 6: Final answer
   x = 10,578.26