Finding the Fourth Proportional to 9,118.05, 12,584.01 and 5,139.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.05 : 12,584.01 = 5,139.23 : x
2. Step 2: Convert to fraction form
   9,118.05/12,584.01 = 5,139.23/x
3. Step 3: Cross multiply
   9,118.05x = 12,584.01 × 5,139.23
4. Step 4: Simplify right side
   9,118.05x = 64,672,058.79
5. Step 5: Solve for x
   x = 64,672,058.79/9,118.05
6. Step 6: Final answer
   x = 7,092.75