Finding the Fourth Proportional to 9,118.29, 12,582.93 and 5,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.29 : 12,582.93 = 5,139.30 : x
2. Step 2: Convert to fraction form
   9,118.29/12,582.93 = 5,139.30/x
3. Step 3: Cross multiply
   9,118.29x = 12,582.93 × 5,139.30
4. Step 4: Simplify right side
   9,118.29x = 64,667,452.15
5. Step 5: Solve for x
   x = 64,667,452.15/9,118.29
6. Step 6: Final answer
   x = 7,092.06