Finding the Fourth Proportional to 1,353.81, 1,867.46 and 856.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.81 : 1,867.46 = 856.58 : x
2. Step 2: Convert to fraction form
   1,353.81/1,867.46 = 856.58/x
3. Step 3: Cross multiply
   1,353.81x = 1,867.46 × 856.58
4. Step 4: Simplify right side
   1,353.81x = 1,599,615.27
5. Step 5: Solve for x
   x = 1,599,615.27/1,353.81
6. Step 6: Final answer
   x = 1,181.56