Finding the Fourth Proportional to 21,007.44, 31,514.34 and 7,153.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,007.44 : 31,514.34 = 7,153.20 : x
2. Step 2: Convert to fraction form
   21,007.44/31,514.34 = 7,153.20/x
3. Step 3: Cross multiply
   21,007.44x = 31,514.34 × 7,153.20
4. Step 4: Simplify right side
   21,007.44x = 225,428,376.89
5. Step 5: Solve for x
   x = 225,428,376.89/21,007.44
6. Step 6: Final answer
   x = 10,730.88