Finding the Fourth Proportional to 8,784.31, 12,118.10 and 5,198.29

Step by Step Solution

1. Step 1: Write the proportion equation
   8,784.31 : 12,118.10 = 5,198.29 : x
2. Step 2: Convert to fraction form
   8,784.31/12,118.10 = 5,198.29/x
3. Step 3: Cross multiply
   8,784.31x = 12,118.10 × 5,198.29
4. Step 4: Simplify right side
   8,784.31x = 62,993,398.05
5. Step 5: Solve for x
   x = 62,993,398.05/8,784.31
6. Step 6: Final answer
   x = 7,171.13