Finding the Fourth Proportional to 20,478.38, 30,724.96 and 7,153.34

Step by Step Solution

1. Step 1: Write the proportion equation
   20,478.38 : 30,724.96 = 7,153.34 : x
2. Step 2: Convert to fraction form
   20,478.38/30,724.96 = 7,153.34/x
3. Step 3: Cross multiply
   20,478.38x = 30,724.96 × 7,153.34
4. Step 4: Simplify right side
   20,478.38x = 219,786,085.37
5. Step 5: Solve for x
   x = 219,786,085.37/20,478.38
6. Step 6: Final answer
   x = 10,732.59