Finding the Fourth Proportional to 13,287.51, 18,329.72 and 7,906.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,287.51 : 18,329.72 = 7,906.12 : x
2. Step 2: Convert to fraction form
   13,287.51/18,329.72 = 7,906.12/x
3. Step 3: Cross multiply
   13,287.51x = 18,329.72 × 7,906.12
4. Step 4: Simplify right side
   13,287.51x = 144,916,965.89
5. Step 5: Solve for x
   x = 144,916,965.89/13,287.51
6. Step 6: Final answer
   x = 10,906.26