Finding the Fourth Proportional to 10,699.10, 14,768.81 and 9,578.03

Step by Step Solution

1. Step 1: Write the proportion equation
   10,699.10 : 14,768.81 = 9,578.03 : x
2. Step 2: Convert to fraction form
   10,699.10/14,768.81 = 9,578.03/x
3. Step 3: Cross multiply
   10,699.10x = 14,768.81 × 9,578.03
4. Step 4: Simplify right side
   10,699.10x = 141,455,983.51
5. Step 5: Solve for x
   x = 141,455,983.51/10,699.10
6. Step 6: Final answer
   x = 13,221.30