Finding the Fourth Proportional to 11,172.23, 15,395.42 and 7,976.51

Step by Step Solution

1. Step 1: Write the proportion equation
   11,172.23 : 15,395.42 = 7,976.51 : x
2. Step 2: Convert to fraction form
   11,172.23/15,395.42 = 7,976.51/x
3. Step 3: Cross multiply
   11,172.23x = 15,395.42 × 7,976.51
4. Step 4: Simplify right side
   11,172.23x = 122,801,721.58
5. Step 5: Solve for x
   x = 122,801,721.58/11,172.23
6. Step 6: Final answer
   x = 10,991.69