Finding the Fourth Proportional to 1,427.60, 1,969.52 and 867.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.60 : 1,969.52 = 867.86 : x
2. Step 2: Convert to fraction form
   1,427.60/1,969.52 = 867.86/x
3. Step 3: Cross multiply
   1,427.60x = 1,969.52 × 867.86
4. Step 4: Simplify right side
   1,427.60x = 1,709,253.44
5. Step 5: Solve for x
   x = 1,709,253.44/1,427.60
6. Step 6: Final answer
   x = 1,197.30