Finding the Fourth Proportional to 8,742.48, 12,066.89 and 5,388.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,742.48 : 12,066.89 = 5,388.05 : x
2. Step 2: Convert to fraction form
   8,742.48/12,066.89 = 5,388.05/x
3. Step 3: Cross multiply
   8,742.48x = 12,066.89 × 5,388.05
4. Step 4: Simplify right side
   8,742.48x = 65,016,992.01
5. Step 5: Solve for x
   x = 65,016,992.01/8,742.48
6. Step 6: Final answer
   x = 7,436.91