Finding the Fourth Proportional to 12,975.10, 17,909.67 and 7,940.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,975.10 : 17,909.67 = 7,940.86 : x
2. Step 2: Convert to fraction form
   12,975.10/17,909.67 = 7,940.86/x
3. Step 3: Cross multiply
   12,975.10x = 17,909.67 × 7,940.86
4. Step 4: Simplify right side
   12,975.10x = 142,218,182.12
5. Step 5: Solve for x
   x = 142,218,182.12/12,975.10
6. Step 6: Final answer
   x = 10,960.85