Finding the Fourth Proportional to 13,665.38, 20,497.71 and 3,805.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,665.38 : 20,497.71 = 3,805.34 : x
2. Step 2: Convert to fraction form
   13,665.38/20,497.71 = 3,805.34/x
3. Step 3: Cross multiply
   13,665.38x = 20,497.71 × 3,805.34
4. Step 4: Simplify right side
   13,665.38x = 78,000,755.77
5. Step 5: Solve for x
   x = 78,000,755.77/13,665.38
6. Step 6: Final answer
   x = 5,707.91