Finding the Fourth Proportional to 21,677.31, 32,520.35 and 12,321.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,677.31 : 32,520.35 = 12,321.81 : x
2. Step 2: Convert to fraction form
   21,677.31/32,520.35 = 12,321.81/x
3. Step 3: Cross multiply
   21,677.31x = 32,520.35 × 12,321.81
4. Step 4: Simplify right side
   21,677.31x = 400,709,604.64
5. Step 5: Solve for x
   x = 400,709,604.64/21,677.31
6. Step 6: Final answer
   x = 18,485.21