Finding the Fourth Proportional to 1,945.36, 2,913.54 and 1,121.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.36 : 2,913.54 = 1,121.59 : x
2. Step 2: Convert to fraction form
   1,945.36/2,913.54 = 1,121.59/x
3. Step 3: Cross multiply
   1,945.36x = 2,913.54 × 1,121.59
4. Step 4: Simplify right side
   1,945.36x = 3,267,797.33
5. Step 5: Solve for x
   x = 3,267,797.33/1,945.36
6. Step 6: Final answer
   x = 1,679.79