Finding the Fourth Proportional to 8,111.27, 12,160.65 and 7,287.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.27 : 12,160.65 = 7,287.05 : x
2. Step 2: Convert to fraction form
   8,111.27/12,160.65 = 7,287.05/x
3. Step 3: Cross multiply
   8,111.27x = 12,160.65 × 7,287.05
4. Step 4: Simplify right side
   8,111.27x = 88,615,264.58
5. Step 5: Solve for x
   x = 88,615,264.58/8,111.27
6. Step 6: Final answer
   x = 10,924.96