Finding the Fourth Proportional to 1,570.81, 2,167.83 and 1,011.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.81 : 2,167.83 = 1,011.31 : x
2. Step 2: Convert to fraction form
   1,570.81/2,167.83 = 1,011.31/x
3. Step 3: Cross multiply
   1,570.81x = 2,167.83 × 1,011.31
4. Step 4: Simplify right side
   1,570.81x = 2,192,348.16
5. Step 5: Solve for x
   x = 2,192,348.16/1,570.81
6. Step 6: Final answer
   x = 1,395.68