Finding the Fourth Proportional to 21,771.71, 32,665.70 and 12,405.95

Step by Step Solution

1. Step 1: Write the proportion equation
   21,771.71 : 32,665.70 = 12,405.95 : x
2. Step 2: Convert to fraction form
   21,771.71/32,665.70 = 12,405.95/x
3. Step 3: Cross multiply
   21,771.71x = 32,665.70 × 12,405.95
4. Step 4: Simplify right side
   21,771.71x = 405,248,978.89
5. Step 5: Solve for x
   x = 405,248,978.89/21,771.71
6. Step 6: Final answer
   x = 18,613.56