Finding the Fourth Proportional to 1,570.81, 2,167.98 and 908.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.81 : 2,167.98 = 908.06 : x
2. Step 2: Convert to fraction form
   1,570.81/2,167.98 = 908.06/x
3. Step 3: Cross multiply
   1,570.81x = 2,167.98 × 908.06
4. Step 4: Simplify right side
   1,570.81x = 1,968,655.15
5. Step 5: Solve for x
   x = 1,968,655.15/1,570.81
6. Step 6: Final answer
   x = 1,253.28