Finding the Fourth Proportional to 9,118.12, 12,582.82 and 5,139.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.12 : 12,582.82 = 5,139.56 : x
2. Step 2: Convert to fraction form
   9,118.12/12,582.82 = 5,139.56/x
3. Step 3: Cross multiply
   9,118.12x = 12,582.82 × 5,139.56
4. Step 4: Simplify right side
   9,118.12x = 64,670,158.36
5. Step 5: Solve for x
   x = 64,670,158.36/9,118.12
6. Step 6: Final answer
   x = 7,092.49