Finding the Fourth Proportional to 21,271.76, 31,910.20 and 7,040.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,271.76 : 31,910.20 = 7,040.72 : x
2. Step 2: Convert to fraction form
   21,271.76/31,910.20 = 7,040.72/x
3. Step 3: Cross multiply
   21,271.76x = 31,910.20 × 7,040.72
4. Step 4: Simplify right side
   21,271.76x = 224,670,783.34
5. Step 5: Solve for x
   x = 224,670,783.34/21,271.76
6. Step 6: Final answer
   x = 10,561.93