Finding the Fourth Proportional to 21,150.88, 31,704.72 and 7,288

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.88 : 31,704.72 = 7,288 : x
2. Step 2: Convert to fraction form
   21,150.88/31,704.72 = 7,288/x
3. Step 3: Cross multiply
   21,150.88x = 31,704.72 × 7,288
4. Step 4: Simplify right side
   21,150.88x = 231,063,999.36
5. Step 5: Solve for x
   x = 231,063,999.36/21,150.88
6. Step 6: Final answer
   x = 10,924.56