Finding the Fourth Proportional to 12,980.39, 17,913.29 and 7,944.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.39 : 17,913.29 = 7,944.51 : x
2. Step 2: Convert to fraction form
   12,980.39/17,913.29 = 7,944.51/x
3. Step 3: Cross multiply
   12,980.39x = 17,913.29 × 7,944.51
4. Step 4: Simplify right side
   12,980.39x = 142,312,311.54
5. Step 5: Solve for x
   x = 142,312,311.54/12,980.39
6. Step 6: Final answer
   x = 10,963.64