Finding the Fourth Proportional to 12,870.05, 17,762.69 and 9,331.97

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.05 : 17,762.69 = 9,331.97 : x
2. Step 2: Convert to fraction form
   12,870.05/17,762.69 = 9,331.97/x
3. Step 3: Cross multiply
   12,870.05x = 17,762.69 × 9,331.97
4. Step 4: Simplify right side
   12,870.05x = 165,760,843.54
5. Step 5: Solve for x
   x = 165,760,843.54/12,870.05
6. Step 6: Final answer
   x = 12,879.58