Finding the Fourth Proportional to 12,378.72, 17,079.87 and 7,340.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,378.72 : 17,079.87 = 7,340.38 : x
2. Step 2: Convert to fraction form
   12,378.72/17,079.87 = 7,340.38/x
3. Step 3: Cross multiply
   12,378.72x = 17,079.87 × 7,340.38
4. Step 4: Simplify right side
   12,378.72x = 125,372,736.15
5. Step 5: Solve for x
   x = 125,372,736.15/12,378.72
6. Step 6: Final answer
   x = 10,128.09