Finding the Fourth Proportional to 1,570.31, 2,167.13 and 871.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.31 : 2,167.13 = 871.69 : x
2. Step 2: Convert to fraction form
   1,570.31/2,167.13 = 871.69/x
3. Step 3: Cross multiply
   1,570.31x = 2,167.13 × 871.69
4. Step 4: Simplify right side
   1,570.31x = 1,889,065.55
5. Step 5: Solve for x
   x = 1,889,065.55/1,570.31
6. Step 6: Final answer
   x = 1,202.99