Finding the Fourth Proportional to 20,631.69, 30,953.72 and 14,639.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,631.69 : 30,953.72 = 14,639.31 : x
2. Step 2: Convert to fraction form
   20,631.69/30,953.72 = 14,639.31/x
3. Step 3: Cross multiply
   20,631.69x = 30,953.72 × 14,639.31
4. Step 4: Simplify right side
   20,631.69x = 453,141,011.10
5. Step 5: Solve for x
   x = 453,141,011.10/20,631.69
6. Step 6: Final answer
   x = 21,963.35