Finding the Fourth Proportional to 12,965.43, 17,890.02 and 7,661.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,965.43 : 17,890.02 = 7,661.91 : x
2. Step 2: Convert to fraction form
   12,965.43/17,890.02 = 7,661.91/x
3. Step 3: Cross multiply
   12,965.43x = 17,890.02 × 7,661.91
4. Step 4: Simplify right side
   12,965.43x = 137,071,723.14
5. Step 5: Solve for x
   x = 137,071,723.14/12,965.43
6. Step 6: Final answer
   x = 10,572.09