Finding the Fourth Proportional to 2,635.71, 3,956.23 and 1,320.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.71 : 3,956.23 = 1,320.40 : x
2. Step 2: Convert to fraction form
   2,635.71/3,956.23 = 1,320.40/x
3. Step 3: Cross multiply
   2,635.71x = 3,956.23 × 1,320.40
4. Step 4: Simplify right side
   2,635.71x = 5,223,799.49
5. Step 5: Solve for x
   x = 5,223,799.49/2,635.71
6. Step 6: Final answer
   x = 1,981.94