Finding the Fourth Proportional to 1,353.97, 1,868.09 and 856.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.97 : 1,868.09 = 856.43 : x
2. Step 2: Convert to fraction form
   1,353.97/1,868.09 = 856.43/x
3. Step 3: Cross multiply
   1,353.97x = 1,868.09 × 856.43
4. Step 4: Simplify right side
   1,353.97x = 1,599,888.32
5. Step 5: Solve for x
   x = 1,599,888.32/1,353.97
6. Step 6: Final answer
   x = 1,181.63