Finding the Fourth Proportional to 1,570.72, 2,167.76 and 872.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.72 : 2,167.76 = 872.16 : x
2. Step 2: Convert to fraction form
   1,570.72/2,167.76 = 872.16/x
3. Step 3: Cross multiply
   1,570.72x = 2,167.76 × 872.16
4. Step 4: Simplify right side
   1,570.72x = 1,890,633.56
5. Step 5: Solve for x
   x = 1,890,633.56/1,570.72
6. Step 6: Final answer
   x = 1,203.67