Finding the Fourth Proportional to 13,976.16, 20,954.52 and 5,208.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,976.16 : 20,954.52 = 5,208.72 : x
2. Step 2: Convert to fraction form
   13,976.16/20,954.52 = 5,208.72/x
3. Step 3: Cross multiply
   13,976.16x = 20,954.52 × 5,208.72
4. Step 4: Simplify right side
   13,976.16x = 109,146,227.41
5. Step 5: Solve for x
   x = 109,146,227.41/13,976.16
6. Step 6: Final answer
   x = 7,809.46