Finding the Fourth Proportional to 21,003.76, 31,506.18 and 7,162.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.76 : 31,506.18 = 7,162.48 : x
2. Step 2: Convert to fraction form
   21,003.76/31,506.18 = 7,162.48/x
3. Step 3: Cross multiply
   21,003.76x = 31,506.18 × 7,162.48
4. Step 4: Simplify right side
   21,003.76x = 225,662,384.13
5. Step 5: Solve for x
   x = 225,662,384.13/21,003.76
6. Step 6: Final answer
   x = 10,743.90