Finding the Fourth Proportional to 21,080.12, 31,615.31 and 7,933.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,080.12 : 31,615.31 = 7,933.82 : x
2. Step 2: Convert to fraction form
   21,080.12/31,615.31 = 7,933.82/x
3. Step 3: Cross multiply
   21,080.12x = 31,615.31 × 7,933.82
4. Step 4: Simplify right side
   21,080.12x = 250,830,040.54
5. Step 5: Solve for x
   x = 250,830,040.54/21,080.12
6. Step 6: Final answer
   x = 11,898.89