Finding the Fourth Proportional to 12,983.39, 17,911.21 and 7,945.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,983.39 : 17,911.21 = 7,945.59 : x
2. Step 2: Convert to fraction form
   12,983.39/17,911.21 = 7,945.59/x
3. Step 3: Cross multiply
   12,983.39x = 17,911.21 × 7,945.59
4. Step 4: Simplify right side
   12,983.39x = 142,315,091.34
5. Step 5: Solve for x
   x = 142,315,091.34/12,983.39
6. Step 6: Final answer
   x = 10,961.32