Finding the Fourth Proportional to 13,960.89, 20,935.83 and 5,639.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,960.89 : 20,935.83 = 5,639.34 : x
2. Step 2: Convert to fraction form
   13,960.89/20,935.83 = 5,639.34/x
3. Step 3: Cross multiply
   13,960.89x = 20,935.83 × 5,639.34
4. Step 4: Simplify right side
   13,960.89x = 118,064,263.55
5. Step 5: Solve for x
   x = 118,064,263.55/13,960.89
6. Step 6: Final answer
   x = 8,456.79