Finding the Fourth Proportional to 2,139.82, 2,953.81 and 1,809.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.82 : 2,953.81 = 1,809.95 : x
2. Step 2: Convert to fraction form
   2,139.82/2,953.81 = 1,809.95/x
3. Step 3: Cross multiply
   2,139.82x = 2,953.81 × 1,809.95
4. Step 4: Simplify right side
   2,139.82x = 5,346,229.12
5. Step 5: Solve for x
   x = 5,346,229.12/2,139.82
6. Step 6: Final answer
   x = 2,498.45