Finding the Fourth Proportional to 1,340.10, 1,847.61 and 867.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.10 : 1,847.61 = 867.20 : x
2. Step 2: Convert to fraction form
   1,340.10/1,847.61 = 867.20/x
3. Step 3: Cross multiply
   1,340.10x = 1,847.61 × 867.20
4. Step 4: Simplify right side
   1,340.10x = 1,602,238.15
5. Step 5: Solve for x
   x = 1,602,238.15/1,340.10
6. Step 6: Final answer
   x = 1,195.61