Finding the Fourth Proportional to 1,945.89, 2,919.38 and 1,080.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.89 : 2,919.38 = 1,080.81 : x
2. Step 2: Convert to fraction form
   1,945.89/2,919.38 = 1,080.81/x
3. Step 3: Cross multiply
   1,945.89x = 2,919.38 × 1,080.81
4. Step 4: Simplify right side
   1,945.89x = 3,155,289.69
5. Step 5: Solve for x
   x = 3,155,289.69/1,945.89
6. Step 6: Final answer
   x = 1,621.51