Finding the Fourth Proportional to 21,678.31, 32,521.85 and 12,322.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,678.31 : 32,521.85 = 12,322.81 : x
2. Step 2: Convert to fraction form
   21,678.31/32,521.85 = 12,322.81/x
3. Step 3: Cross multiply
   21,678.31x = 32,521.85 × 12,322.81
4. Step 4: Simplify right side
   21,678.31x = 400,760,578.40
5. Step 5: Solve for x
   x = 400,760,578.40/21,678.31
6. Step 6: Final answer
   x = 18,486.71