Finding the Fourth Proportional to 13,792.05, 20,681.94 and 3,929.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,792.05 : 20,681.94 = 3,929.10 : x
2. Step 2: Convert to fraction form
   13,792.05/20,681.94 = 3,929.10/x
3. Step 3: Cross multiply
   13,792.05x = 20,681.94 × 3,929.10
4. Step 4: Simplify right side
   13,792.05x = 81,261,410.45
5. Step 5: Solve for x
   x = 81,261,410.45/13,792.05
6. Step 6: Final answer
   x = 5,891.90