Finding the Fourth Proportional to 8,780.49, 12,108.83 and 5,791.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.49 : 12,108.83 = 5,791.12 : x
2. Step 2: Convert to fraction form
   8,780.49/12,108.83 = 5,791.12/x
3. Step 3: Cross multiply
   8,780.49x = 12,108.83 × 5,791.12
4. Step 4: Simplify right side
   8,780.49x = 70,123,628.36
5. Step 5: Solve for x
   x = 70,123,628.36/8,780.49
6. Step 6: Final answer
   x = 7,986.30