Finding the Fourth Proportional to 9,839.10, 13,809.30 and 9,839.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,839.10 : 13,809.30 = 9,839.10 : x
2. Step 2: Convert to fraction form
   9,839.10/13,809.30 = 9,839.10/x
3. Step 3: Cross multiply
   9,839.10x = 13,809.30 × 9,839.10
4. Step 4: Simplify right side
   9,839.10x = 135,871,083.63
5. Step 5: Solve for x
   x = 135,871,083.63/9,839.10
6. Step 6: Final answer
   x = 13,809.30