Finding the Fourth Proportional to 1,806.39, 2,708.31 and 985.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,806.39 : 2,708.31 = 985.05 : x
2. Step 2: Convert to fraction form
   1,806.39/2,708.31 = 985.05/x
3. Step 3: Cross multiply
   1,806.39x = 2,708.31 × 985.05
4. Step 4: Simplify right side
   1,806.39x = 2,667,820.77
5. Step 5: Solve for x
   x = 2,667,820.77/1,806.39
6. Step 6: Final answer
   x = 1,476.88