Finding the Fourth Proportional to 13,055.92, 18,021.72 and 7,755.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,055.92 : 18,021.72 = 7,755.28 : x
2. Step 2: Convert to fraction form
   13,055.92/18,021.72 = 7,755.28/x
3. Step 3: Cross multiply
   13,055.92x = 18,021.72 × 7,755.28
4. Step 4: Simplify right side
   13,055.92x = 139,763,484.68
5. Step 5: Solve for x
   x = 139,763,484.68/13,055.92
6. Step 6: Final answer
   x = 10,704.99