Finding the Fourth Proportional to 21,617.82, 32,434.56 and 8,479.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,617.82 : 32,434.56 = 8,479.17 : x
2. Step 2: Convert to fraction form
   21,617.82/32,434.56 = 8,479.17/x
3. Step 3: Cross multiply
   21,617.82x = 32,434.56 × 8,479.17
4. Step 4: Simplify right side
   21,617.82x = 275,018,148.12
5. Step 5: Solve for x
   x = 275,018,148.12/21,617.82
6. Step 6: Final answer
   x = 12,721.83