Finding the Fourth Proportional to 21,496.21, 32,215.16 and 12,131.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,496.21 : 32,215.16 = 12,131.60 : x
2. Step 2: Convert to fraction form
   21,496.21/32,215.16 = 12,131.60/x
3. Step 3: Cross multiply
   21,496.21x = 32,215.16 × 12,131.60
4. Step 4: Simplify right side
   21,496.21x = 390,821,213.32
5. Step 5: Solve for x
   x = 390,821,213.32/21,496.21
6. Step 6: Final answer
   x = 18,180.94