Finding the Fourth Proportional to 1,853.31, 2,780.69 and 1,123.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,853.31 : 2,780.69 = 1,123.41 : x
2. Step 2: Convert to fraction form
   1,853.31/2,780.69 = 1,123.41/x
3. Step 3: Cross multiply
   1,853.31x = 2,780.69 × 1,123.41
4. Step 4: Simplify right side
   1,853.31x = 3,123,849.34
5. Step 5: Solve for x
   x = 3,123,849.34/1,853.31
6. Step 6: Final answer
   x = 1,685.55