Finding the Fourth Proportional to 1,965.78, 2,712.83 and 1,179.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,965.78 : 2,712.83 = 1,179.81 : x
2. Step 2: Convert to fraction form
   1,965.78/2,712.83 = 1,179.81/x
3. Step 3: Cross multiply
   1,965.78x = 2,712.83 × 1,179.81
4. Step 4: Simplify right side
   1,965.78x = 3,200,618.06
5. Step 5: Solve for x
   x = 3,200,618.06/1,965.78
6. Step 6: Final answer
   x = 1,628.17