Finding the Fourth Proportional to 21,003.30, 31,505.83 and 9,769.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.30 : 31,505.83 = 9,769.18 : x
2. Step 2: Convert to fraction form
   21,003.30/31,505.83 = 9,769.18/x
3. Step 3: Cross multiply
   21,003.30x = 31,505.83 × 9,769.18
4. Step 4: Simplify right side
   21,003.30x = 307,786,021.13
5. Step 5: Solve for x
   x = 307,786,021.13/21,003.30
6. Step 6: Final answer
   x = 14,654.17