Finding the Fourth Proportional to 2,139.57, 3,204.54 and 1,858.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.57 : 3,204.54 = 1,858.32 : x
2. Step 2: Convert to fraction form
   2,139.57/3,204.54 = 1,858.32/x
3. Step 3: Cross multiply
   2,139.57x = 3,204.54 × 1,858.32
4. Step 4: Simplify right side
   2,139.57x = 5,955,060.77
5. Step 5: Solve for x
   x = 5,955,060.77/2,139.57
6. Step 6: Final answer
   x = 2,783.30