Finding the Fourth Proportional to 9,118.78, 12,583.42 and 5,140.67

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.78 : 12,583.42 = 5,140.67 : x
2. Step 2: Convert to fraction form
   9,118.78/12,583.42 = 5,140.67/x
3. Step 3: Cross multiply
   9,118.78x = 12,583.42 × 5,140.67
4. Step 4: Simplify right side
   9,118.78x = 64,687,133.92
5. Step 5: Solve for x
   x = 64,687,133.92/9,118.78
6. Step 6: Final answer
   x = 7,093.84