Finding the Fourth Proportional to 12,959.50, 17,883.83 and 7,216.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,959.50 : 17,883.83 = 7,216.91 : x
2. Step 2: Convert to fraction form
   12,959.50/17,883.83 = 7,216.91/x
3. Step 3: Cross multiply
   12,959.50x = 17,883.83 × 7,216.91
4. Step 4: Simplify right side
   12,959.50x = 129,066,047.25
5. Step 5: Solve for x
   x = 129,066,047.25/12,959.50
6. Step 6: Final answer
   x = 9,959.18