Finding the Fourth Proportional to 13,766.43, 20,646.71 and 3,905.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,766.43 : 20,646.71 = 3,905.81 : x
2. Step 2: Convert to fraction form
   13,766.43/20,646.71 = 3,905.81/x
3. Step 3: Cross multiply
   13,766.43x = 20,646.71 × 3,905.81
4. Step 4: Simplify right side
   13,766.43x = 80,642,126.39
5. Step 5: Solve for x
   x = 80,642,126.39/13,766.43
6. Step 6: Final answer
   x = 5,857.88