Finding the Fourth Proportional to 1,354.28, 1,868.10 and 856.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,354.28 : 1,868.10 = 856.05 : x
2. Step 2: Convert to fraction form
   1,354.28/1,868.10 = 856.05/x
3. Step 3: Cross multiply
   1,354.28x = 1,868.10 × 856.05
4. Step 4: Simplify right side
   1,354.28x = 1,599,187.01
5. Step 5: Solve for x
   x = 1,599,187.01/1,354.28
6. Step 6: Final answer
   x = 1,180.84