Finding the Fourth Proportional to 12,980.29, 17,914.20 and 7,947.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.29 : 17,914.20 = 7,947.90 : x
2. Step 2: Convert to fraction form
   12,980.29/17,914.20 = 7,947.90/x
3. Step 3: Cross multiply
   12,980.29x = 17,914.20 × 7,947.90
4. Step 4: Simplify right side
   12,980.29x = 142,380,270.18
5. Step 5: Solve for x
   x = 142,380,270.18/12,980.29
6. Step 6: Final answer
   x = 10,968.96