Finding the Fourth Proportional to 2,009.99, 3,012.56 and 853.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,009.99 : 3,012.56 = 853.31 : x
2. Step 2: Convert to fraction form
   2,009.99/3,012.56 = 853.31/x
3. Step 3: Cross multiply
   2,009.99x = 3,012.56 × 853.31
4. Step 4: Simplify right side
   2,009.99x = 2,570,654.04
5. Step 5: Solve for x
   x = 2,570,654.04/2,009.99
6. Step 6: Final answer
   x = 1,278.94