Finding the Fourth Proportional to 1,805.10, 2,489.72 and 1,380.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.10 : 2,489.72 = 1,380.68 : x
2. Step 2: Convert to fraction form
   1,805.10/2,489.72 = 1,380.68/x
3. Step 3: Cross multiply
   1,805.10x = 2,489.72 × 1,380.68
4. Step 4: Simplify right side
   1,805.10x = 3,437,496.59
5. Step 5: Solve for x
   x = 3,437,496.59/1,805.10
6. Step 6: Final answer
   x = 1,904.33