Finding the Fourth Proportional to 3,540.16, 5,309.52 and 1,981.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,540.16 : 5,309.52 = 1,981.72 : x
2. Step 2: Convert to fraction form
   3,540.16/5,309.52 = 1,981.72/x
3. Step 3: Cross multiply
   3,540.16x = 5,309.52 × 1,981.72
4. Step 4: Simplify right side
   3,540.16x = 10,521,981.97
5. Step 5: Solve for x
   x = 10,521,981.97/3,540.16
6. Step 6: Final answer
   x = 2,972.18