Finding the Fourth Proportional to 9,380.32, 12,945.18 and 5,188.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,380.32 : 12,945.18 = 5,188.60 : x
2. Step 2: Convert to fraction form
   9,380.32/12,945.18 = 5,188.60/x
3. Step 3: Cross multiply
   9,380.32x = 12,945.18 × 5,188.60
4. Step 4: Simplify right side
   9,380.32x = 67,167,360.95
5. Step 5: Solve for x
   x = 67,167,360.95/9,380.32
6. Step 6: Final answer
   x = 7,160.46