Finding the Fourth Proportional to 2,427.71, 3,640.64 and 867.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,427.71 : 3,640.64 = 867.42 : x
2. Step 2: Convert to fraction form
   2,427.71/3,640.64 = 867.42/x
3. Step 3: Cross multiply
   2,427.71x = 3,640.64 × 867.42
4. Step 4: Simplify right side
   2,427.71x = 3,157,959.61
5. Step 5: Solve for x
   x = 3,157,959.61/2,427.71
6. Step 6: Final answer
   x = 1,300.80