Finding the Fourth Proportional to 21,986.64, 32,983.20 and 7,947.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,986.64 : 32,983.20 = 7,947.72 : x
2. Step 2: Convert to fraction form
   21,986.64/32,983.20 = 7,947.72/x
3. Step 3: Cross multiply
   21,986.64x = 32,983.20 × 7,947.72
4. Step 4: Simplify right side
   21,986.64x = 262,141,238.30
5. Step 5: Solve for x
   x = 262,141,238.30/21,986.64
6. Step 6: Final answer
   x = 11,922.75