Finding the Fourth Proportional to 1,805.34, 2,489.67 and 1,539.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.34 : 2,489.67 = 1,539.89 : x
2. Step 2: Convert to fraction form
   1,805.34/2,489.67 = 1,539.89/x
3. Step 3: Cross multiply
   1,805.34x = 2,489.67 × 1,539.89
4. Step 4: Simplify right side
   1,805.34x = 3,833,805.49
5. Step 5: Solve for x
   x = 3,833,805.49/1,805.34
6. Step 6: Final answer
   x = 2,123.59