Finding the Fourth Proportional to 1,979.22, 2,730.96 and 1,139.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,979.22 : 2,730.96 = 1,139.81 : x
2. Step 2: Convert to fraction form
   1,979.22/2,730.96 = 1,139.81/x
3. Step 3: Cross multiply
   1,979.22x = 2,730.96 × 1,139.81
4. Step 4: Simplify right side
   1,979.22x = 3,112,761.86
5. Step 5: Solve for x
   x = 3,112,761.86/1,979.22
6. Step 6: Final answer
   x = 1,572.72