Finding the Fourth Proportional to 1,899.98, 2,851.42 and 805.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.98 : 2,851.42 = 805.12 : x
2. Step 2: Convert to fraction form
   1,899.98/2,851.42 = 805.12/x
3. Step 3: Cross multiply
   1,899.98x = 2,851.42 × 805.12
4. Step 4: Simplify right side
   1,899.98x = 2,295,735.27
5. Step 5: Solve for x
   x = 2,295,735.27/1,899.98
6. Step 6: Final answer
   x = 1,208.29