Finding the Fourth Proportional to 13,841.94, 20,760.12 and 3,978.90

Step by Step Solution

1. Step 1: Write the proportion equation
   13,841.94 : 20,760.12 = 3,978.90 : x
2. Step 2: Convert to fraction form
   13,841.94/20,760.12 = 3,978.90/x
3. Step 3: Cross multiply
   13,841.94x = 20,760.12 × 3,978.90
4. Step 4: Simplify right side
   13,841.94x = 82,602,441.47
5. Step 5: Solve for x
   x = 82,602,441.47/13,841.94
6. Step 6: Final answer
   x = 5,967.55