Finding the Fourth Proportional to 20,478.17, 30,730.32 and 13,472.27

Step by Step Solution

1. Step 1: Write the proportion equation
   20,478.17 : 30,730.32 = 13,472.27 : x
2. Step 2: Convert to fraction form
   20,478.17/30,730.32 = 13,472.27/x
3. Step 3: Cross multiply
   20,478.17x = 30,730.32 × 13,472.27
4. Step 4: Simplify right side
   20,478.17x = 414,007,168.23
5. Step 5: Solve for x
   x = 414,007,168.23/20,478.17
6. Step 6: Final answer
   x = 20,217.00