Finding the Fourth Proportional to 9,118.17, 12,582.54 and 5,139.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.17 : 12,582.54 = 5,139.48 : x
2. Step 2: Convert to fraction form
   9,118.17/12,582.54 = 5,139.48/x
3. Step 3: Cross multiply
   9,118.17x = 12,582.54 × 5,139.48
4. Step 4: Simplify right side
   9,118.17x = 64,667,712.68
5. Step 5: Solve for x
   x = 64,667,712.68/9,118.17
6. Step 6: Final answer
   x = 7,092.18