Finding the Fourth Proportional to 9,118.54, 12,582.36 and 5,139.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.54 : 12,582.36 = 5,139.34 : x
2. Step 2: Convert to fraction form
   9,118.54/12,582.36 = 5,139.34/x
3. Step 3: Cross multiply
   9,118.54x = 12,582.36 × 5,139.34
4. Step 4: Simplify right side
   9,118.54x = 64,665,026.04
5. Step 5: Solve for x
   x = 64,665,026.04/9,118.54
6. Step 6: Final answer
   x = 7,091.60