Finding the Fourth Proportional to 1,570.34, 2,167.23 and 871.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.34 : 2,167.23 = 871.72 : x
2. Step 2: Convert to fraction form
   1,570.34/2,167.23 = 871.72/x
3. Step 3: Cross multiply
   1,570.34x = 2,167.23 × 871.72
4. Step 4: Simplify right side
   1,570.34x = 1,889,217.74
5. Step 5: Solve for x
   x = 1,889,217.74/1,570.34
6. Step 6: Final answer
   x = 1,203.06