Finding the Fourth Proportional to 9,118.51, 12,583.38 and 5,139.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.51 : 12,583.38 = 5,139.55 : x
2. Step 2: Convert to fraction form
   9,118.51/12,583.38 = 5,139.55/x
3. Step 3: Cross multiply
   9,118.51x = 12,583.38 × 5,139.55
4. Step 4: Simplify right side
   9,118.51x = 64,672,910.68
5. Step 5: Solve for x
   x = 64,672,910.68/9,118.51
6. Step 6: Final answer
   x = 7,092.49