Finding the Fourth Proportional to 8,780.29, 12,119.20 and 5,005.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.29 : 12,119.20 = 5,005.42 : x
2. Step 2: Convert to fraction form
   8,780.29/12,119.20 = 5,005.42/x
3. Step 3: Cross multiply
   8,780.29x = 12,119.20 × 5,005.42
4. Step 4: Simplify right side
   8,780.29x = 60,661,643.25
5. Step 5: Solve for x
   x = 60,661,643.25/8,780.29
6. Step 6: Final answer
   x = 6,908.84