Finding the Fourth Proportional to 21,664.80, 32,499.88 and 7,621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,664.80 : 32,499.88 = 7,621.50 : x
2. Step 2: Convert to fraction form
   21,664.80/32,499.88 = 7,621.50/x
3. Step 3: Cross multiply
   21,664.80x = 32,499.88 × 7,621.50
4. Step 4: Simplify right side
   21,664.80x = 247,697,835.42
5. Step 5: Solve for x
   x = 247,697,835.42/21,664.80
6. Step 6: Final answer
   x = 11,433.19