Finding the Fourth Proportional to 2,139.35, 3,203.23 and 1,111.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.35 : 3,203.23 = 1,111.19 : x
2. Step 2: Convert to fraction form
   2,139.35/3,203.23 = 1,111.19/x
3. Step 3: Cross multiply
   2,139.35x = 3,203.23 × 1,111.19
4. Step 4: Simplify right side
   2,139.35x = 3,559,397.14
5. Step 5: Solve for x
   x = 3,559,397.14/2,139.35
6. Step 6: Final answer
   x = 1,663.78