Finding the Fourth Proportional to 9,381.30, 12,945.06 and 5,189.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,381.30 : 12,945.06 = 5,189.28 : x
2. Step 2: Convert to fraction form
   9,381.30/12,945.06 = 5,189.28/x
3. Step 3: Cross multiply
   9,381.30x = 12,945.06 × 5,189.28
4. Step 4: Simplify right side
   9,381.30x = 67,175,540.96
5. Step 5: Solve for x
   x = 67,175,540.96/9,381.30
6. Step 6: Final answer
   x = 7,160.58