Finding the Fourth Proportional to 1,570.98, 2,167.92 and 872.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.98 : 2,167.92 = 872.31 : x
2. Step 2: Convert to fraction form
   1,570.98/2,167.92 = 872.31/x
3. Step 3: Cross multiply
   1,570.98x = 2,167.92 × 872.31
4. Step 4: Simplify right side
   1,570.98x = 1,891,099.35
5. Step 5: Solve for x
   x = 1,891,099.35/1,570.98
6. Step 6: Final answer
   x = 1,203.77