Finding the Fourth Proportional to 12,805.03, 17,669.65 and 7,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,805.03 : 17,669.65 = 7,139.25 : x
2. Step 2: Convert to fraction form
   12,805.03/17,669.65 = 7,139.25/x
3. Step 3: Cross multiply
   12,805.03x = 17,669.65 × 7,139.25
4. Step 4: Simplify right side
   12,805.03x = 126,147,924.72
5. Step 5: Solve for x
   x = 126,147,924.72/12,805.03
6. Step 6: Final answer
   x = 9,851.44