Finding the Fourth Proportional to 21,835.50, 32,758.20 and 7,984.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,835.50 : 32,758.20 = 7,984.50 : x
2. Step 2: Convert to fraction form
   21,835.50/32,758.20 = 7,984.50/x
3. Step 3: Cross multiply
   21,835.50x = 32,758.20 × 7,984.50
4. Step 4: Simplify right side
   21,835.50x = 261,557,847.90
5. Step 5: Solve for x
   x = 261,557,847.90/21,835.50
6. Step 6: Final answer
   x = 11,978.56