Finding the Fourth Proportional to 12,978.14, 17,910.18 and 7,942.26

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.14 : 17,910.18 = 7,942.26 : x
2. Step 2: Convert to fraction form
   12,978.14/17,910.18 = 7,942.26/x
3. Step 3: Cross multiply
   12,978.14x = 17,910.18 × 7,942.26
4. Step 4: Simplify right side
   12,978.14x = 142,247,306.21
5. Step 5: Solve for x
   x = 142,247,306.21/12,978.14
6. Step 6: Final answer
   x = 10,960.54