Finding the Fourth Proportional to 20,963.76, 31,434.71 and 7,805.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,963.76 : 31,434.71 = 7,805.31 : x
2. Step 2: Convert to fraction form
   20,963.76/31,434.71 = 7,805.31/x
3. Step 3: Cross multiply
   20,963.76x = 31,434.71 × 7,805.31
4. Step 4: Simplify right side
   20,963.76x = 245,357,698.18
5. Step 5: Solve for x
   x = 245,357,698.18/20,963.76
6. Step 6: Final answer
   x = 11,703.90