Finding the Fourth Proportional to 1,945.81, 2,920.47 and 1,319.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.81 : 2,920.47 = 1,319.59 : x
2. Step 2: Convert to fraction form
   1,945.81/2,920.47 = 1,319.59/x
3. Step 3: Cross multiply
   1,945.81x = 2,920.47 × 1,319.59
4. Step 4: Simplify right side
   1,945.81x = 3,853,823.01
5. Step 5: Solve for x
   x = 3,853,823.01/1,945.81
6. Step 6: Final answer
   x = 1,980.58