Finding the Fourth Proportional to 21,608.58, 32,411.91 and 12,381.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,608.58 : 32,411.91 = 12,381.06 : x
2. Step 2: Convert to fraction form
   21,608.58/32,411.91 = 12,381.06/x
3. Step 3: Cross multiply
   21,608.58x = 32,411.91 × 12,381.06
4. Step 4: Simplify right side
   21,608.58x = 401,293,802.42
5. Step 5: Solve for x
   x = 401,293,802.42/21,608.58
6. Step 6: Final answer
   x = 18,571.04