Finding the Fourth Proportional to 9,118.20, 12,582.42 and 5,139.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.20 : 12,582.42 = 5,139.12 : x
2. Step 2: Convert to fraction form
   9,118.20/12,582.42 = 5,139.12/x
3. Step 3: Cross multiply
   9,118.20x = 12,582.42 × 5,139.12
4. Step 4: Simplify right side
   9,118.20x = 64,662,566.27
5. Step 5: Solve for x
   x = 64,662,566.27/9,118.20
6. Step 6: Final answer
   x = 7,091.59