Finding the Fourth Proportional to 1,581.36, 2,185.56 and 1,402.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.36 : 2,185.56 = 1,402.80 : x
2. Step 2: Convert to fraction form
   1,581.36/2,185.56 = 1,402.80/x
3. Step 3: Cross multiply
   1,581.36x = 2,185.56 × 1,402.80
4. Step 4: Simplify right side
   1,581.36x = 3,065,903.57
5. Step 5: Solve for x
   x = 3,065,903.57/1,581.36
6. Step 6: Final answer
   x = 1,938.78