Finding the Fourth Proportional to 1,570.31, 2,167.06 and 862.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.31 : 2,167.06 = 862.18 : x
2. Step 2: Convert to fraction form
   1,570.31/2,167.06 = 862.18/x
3. Step 3: Cross multiply
   1,570.31x = 2,167.06 × 862.18
4. Step 4: Simplify right side
   1,570.31x = 1,868,395.79
5. Step 5: Solve for x
   x = 1,868,395.79/1,570.31
6. Step 6: Final answer
   x = 1,189.83