Finding the Fourth Proportional to 1,570.94, 2,168.01 and 872.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.94 : 2,168.01 = 872.31 : x
2. Step 2: Convert to fraction form
   1,570.94/2,168.01 = 872.31/x
3. Step 3: Cross multiply
   1,570.94x = 2,168.01 × 872.31
4. Step 4: Simplify right side
   1,570.94x = 1,891,176.80
5. Step 5: Solve for x
   x = 1,891,176.80/1,570.94
6. Step 6: Final answer
   x = 1,203.85