Finding the Fourth Proportional to 23,685.21, 32,685.64 and 12,930.09

Step by Step Solution

1. Step 1: Write the proportion equation
   23,685.21 : 32,685.64 = 12,930.09 : x
2. Step 2: Convert to fraction form
   23,685.21/32,685.64 = 12,930.09/x
3. Step 3: Cross multiply
   23,685.21x = 32,685.64 × 12,930.09
4. Step 4: Simplify right side
   23,685.21x = 422,628,266.91
5. Step 5: Solve for x
   x = 422,628,266.91/23,685.21
6. Step 6: Final answer
   x = 17,843.55