Finding the Fourth Proportional to 1,570.88, 2,167.86 and 872.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.88 : 2,167.86 = 872.30 : x
2. Step 2: Convert to fraction form
   1,570.88/2,167.86 = 872.30/x
3. Step 3: Cross multiply
   1,570.88x = 2,167.86 × 872.30
4. Step 4: Simplify right side
   1,570.88x = 1,891,024.28
5. Step 5: Solve for x
   x = 1,891,024.28/1,570.88
6. Step 6: Final answer
   x = 1,203.80