Finding the Fourth Proportional to 2,139.51, 3,203.82 and 1,811.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.51 : 3,203.82 = 1,811.46 : x
2. Step 2: Convert to fraction form
   2,139.51/3,203.82 = 1,811.46/x
3. Step 3: Cross multiply
   2,139.51x = 3,203.82 × 1,811.46
4. Step 4: Simplify right side
   2,139.51x = 5,803,591.78
5. Step 5: Solve for x
   x = 5,803,591.78/2,139.51
6. Step 6: Final answer
   x = 2,712.58