Finding the Fourth Proportional to 2,665.41, 3,991.28 and 1,971.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.41 : 3,991.28 = 1,971.03 : x
2. Step 2: Convert to fraction form
   2,665.41/3,991.28 = 1,971.03/x
3. Step 3: Cross multiply
   2,665.41x = 3,991.28 × 1,971.03
4. Step 4: Simplify right side
   2,665.41x = 7,866,937.73
5. Step 5: Solve for x
   x = 7,866,937.73/2,665.41
6. Step 6: Final answer
   x = 2,951.50