Finding the Fourth Proportional to 21,040.76, 31,551.42 and 7,883.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,040.76 : 31,551.42 = 7,883.72 : x
2. Step 2: Convert to fraction form
   21,040.76/31,551.42 = 7,883.72/x
3. Step 3: Cross multiply
   21,040.76x = 31,551.42 × 7,883.72
4. Step 4: Simplify right side
   21,040.76x = 248,742,560.88
5. Step 5: Solve for x
   x = 248,742,560.88/21,040.76
6. Step 6: Final answer
   x = 11,821.94