Finding the Fourth Proportional to 21,003.27, 31,499.43 and 9,907.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.27 : 31,499.43 = 9,907.03 : x
2. Step 2: Convert to fraction form
   21,003.27/31,499.43 = 9,907.03/x
3. Step 3: Cross multiply
   21,003.27x = 31,499.43 × 9,907.03
4. Step 4: Simplify right side
   21,003.27x = 312,065,797.99
5. Step 5: Solve for x
   x = 312,065,797.99/21,003.27
6. Step 6: Final answer
   x = 14,857.96