Finding the Fourth Proportional to 1,353.96, 1,868.72 and 856.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.96 : 1,868.72 = 856.26 : x
2. Step 2: Convert to fraction form
   1,353.96/1,868.72 = 856.26/x
3. Step 3: Cross multiply
   1,353.96x = 1,868.72 × 856.26
4. Step 4: Simplify right side
   1,353.96x = 1,600,105.91
5. Step 5: Solve for x
   x = 1,600,105.91/1,353.96
6. Step 6: Final answer
   x = 1,181.80