Finding the Fourth Proportional to 9,118.41, 12,582.43 and 5,139.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.41 : 12,582.43 = 5,139.48 : x
2. Step 2: Convert to fraction form
   9,118.41/12,582.43 = 5,139.48/x
3. Step 3: Cross multiply
   9,118.41x = 12,582.43 × 5,139.48
4. Step 4: Simplify right side
   9,118.41x = 64,667,147.34
5. Step 5: Solve for x
   x = 64,667,147.34/9,118.41
6. Step 6: Final answer
   x = 7,091.93