Finding the Fourth Proportional to 9,380.62, 12,945.22 and 5,188.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,380.62 : 12,945.22 = 5,188.87 : x
2. Step 2: Convert to fraction form
   9,380.62/12,945.22 = 5,188.87/x
3. Step 3: Cross multiply
   9,380.62x = 12,945.22 × 5,188.87
4. Step 4: Simplify right side
   9,380.62x = 67,171,063.70
5. Step 5: Solve for x
   x = 67,171,063.70/9,380.62
6. Step 6: Final answer
   x = 7,160.62