Finding the Fourth Proportional to 8,781.72, 12,119.11 and 5,005.48

Step by Step Solution

1. Step 1: Write the proportion equation
   8,781.72 : 12,119.11 = 5,005.48 : x
2. Step 2: Convert to fraction form
   8,781.72/12,119.11 = 5,005.48/x
3. Step 3: Cross multiply
   8,781.72x = 12,119.11 × 5,005.48
4. Step 4: Simplify right side
   8,781.72x = 60,661,962.72
5. Step 5: Solve for x
   x = 60,661,962.72/8,781.72
6. Step 6: Final answer
   x = 6,907.75