Finding the Fourth Proportional to 1,949.50, 2,690.31 and 1,287.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,949.50 : 2,690.31 = 1,287.46 : x
2. Step 2: Convert to fraction form
   1,949.50/2,690.31 = 1,287.46/x
3. Step 3: Cross multiply
   1,949.50x = 2,690.31 × 1,287.46
4. Step 4: Simplify right side
   1,949.50x = 3,463,666.51
5. Step 5: Solve for x
   x = 3,463,666.51/1,949.50
6. Step 6: Final answer
   x = 1,776.69