Finding the Fourth Proportional to 9,380.56, 12,945.12 and 5,188.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,380.56 : 12,945.12 = 5,188.72 : x
2. Step 2: Convert to fraction form
   9,380.56/12,945.12 = 5,188.72/x
3. Step 3: Cross multiply
   9,380.56x = 12,945.12 × 5,188.72
4. Step 4: Simplify right side
   9,380.56x = 67,168,603.05
5. Step 5: Solve for x
   x = 67,168,603.05/9,380.56
6. Step 6: Final answer
   x = 7,160.40