Finding the Fourth Proportional to 1,945.40, 2,920.18 and 1,079.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.40 : 2,920.18 = 1,079.48 : x
2. Step 2: Convert to fraction form
   1,945.40/2,920.18 = 1,079.48/x
3. Step 3: Cross multiply
   1,945.40x = 2,920.18 × 1,079.48
4. Step 4: Simplify right side
   1,945.40x = 3,152,275.91
5. Step 5: Solve for x
   x = 3,152,275.91/1,945.40
6. Step 6: Final answer
   x = 1,620.37