Finding the Fourth Proportional to 12,981.16, 17,914.36 and 7,945.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,981.16 : 17,914.36 = 7,945.28 : x
2. Step 2: Convert to fraction form
   12,981.16/17,914.36 = 7,945.28/x
3. Step 3: Cross multiply
   12,981.16x = 17,914.36 × 7,945.28
4. Step 4: Simplify right side
   12,981.16x = 142,334,606.22
5. Step 5: Solve for x
   x = 142,334,606.22/12,981.16
6. Step 6: Final answer
   x = 10,964.71