Finding the Fourth Proportional to 9,118.68, 12,583.98 and 5,139.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.68 : 12,583.98 = 5,139.60 : x
2. Step 2: Convert to fraction form
   9,118.68/12,583.98 = 5,139.60/x
3. Step 3: Cross multiply
   9,118.68x = 12,583.98 × 5,139.60
4. Step 4: Simplify right side
   9,118.68x = 64,676,623.61
5. Step 5: Solve for x
   x = 64,676,623.61/9,118.68
6. Step 6: Final answer
   x = 7,092.76