Finding the Fourth Proportional to 21,492.84, 32,238.72 and 12,664.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,492.84 : 32,238.72 = 12,664.16 : x
2. Step 2: Convert to fraction form
   21,492.84/32,238.72 = 12,664.16/x
3. Step 3: Cross multiply
   21,492.84x = 32,238.72 × 12,664.16
4. Step 4: Simplify right side
   21,492.84x = 408,276,308.28
5. Step 5: Solve for x
   x = 408,276,308.28/21,492.84
6. Step 6: Final answer
   x = 18,995.92