Finding the Fourth Proportional to 1,427.81, 1,970.69 and 868.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.81 : 1,970.69 = 868.16 : x
2. Step 2: Convert to fraction form
   1,427.81/1,970.69 = 868.16/x
3. Step 3: Cross multiply
   1,427.81x = 1,970.69 × 868.16
4. Step 4: Simplify right side
   1,427.81x = 1,710,864.38
5. Step 5: Solve for x
   x = 1,710,864.38/1,427.81
6. Step 6: Final answer
   x = 1,198.25