Finding the Fourth Proportional to 1,570.62, 2,167.50 and 871.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.62 : 2,167.50 = 871.98 : x
2. Step 2: Convert to fraction form
   1,570.62/2,167.50 = 871.98/x
3. Step 3: Cross multiply
   1,570.62x = 2,167.50 × 871.98
4. Step 4: Simplify right side
   1,570.62x = 1,890,016.65
5. Step 5: Solve for x
   x = 1,890,016.65/1,570.62
6. Step 6: Final answer
   x = 1,203.36