Finding the Fourth Proportional to 21,986.40, 32,981.12 and 7,954.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,986.40 : 32,981.12 = 7,954.72 : x
2. Step 2: Convert to fraction form
   21,986.40/32,981.12 = 7,954.72/x
3. Step 3: Cross multiply
   21,986.40x = 32,981.12 × 7,954.72
4. Step 4: Simplify right side
   21,986.40x = 262,355,574.89
5. Step 5: Solve for x
   x = 262,355,574.89/21,986.40
6. Step 6: Final answer
   x = 11,932.63