Finding the Fourth Proportional to 21,760.65, 32,643 and 7,719.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,760.65 : 32,643 = 7,719.30 : x
2. Step 2: Convert to fraction form
   21,760.65/32,643 = 7,719.30/x
3. Step 3: Cross multiply
   21,760.65x = 32,643 × 7,719.30
4. Step 4: Simplify right side
   21,760.65x = 251,981,109.90
5. Step 5: Solve for x
   x = 251,981,109.90/21,760.65
6. Step 6: Final answer
   x = 11,579.67