Finding the Fourth Proportional to 20,868.63, 31,304.76 and 5,286.25

Step by Step Solution

1. Step 1: Write the proportion equation
   20,868.63 : 31,304.76 = 5,286.25 : x
2. Step 2: Convert to fraction form
   20,868.63/31,304.76 = 5,286.25/x
3. Step 3: Cross multiply
   20,868.63x = 31,304.76 × 5,286.25
4. Step 4: Simplify right side
   20,868.63x = 165,484,787.55
5. Step 5: Solve for x
   x = 165,484,787.55/20,868.63
6. Step 6: Final answer
   x = 7,929.83