Finding the Fourth Proportional to 13,981.76, 20,968.52 and 4,120.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,981.76 : 20,968.52 = 4,120.82 : x
2. Step 2: Convert to fraction form
   13,981.76/20,968.52 = 4,120.82/x
3. Step 3: Cross multiply
   13,981.76x = 20,968.52 × 4,120.82
4. Step 4: Simplify right side
   13,981.76x = 86,407,496.59
5. Step 5: Solve for x
   x = 86,407,496.59/13,981.76
6. Step 6: Final answer
   x = 6,180.02