Finding the Fourth Proportional to 1,528.56, 2,109.34 and 856.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.56 : 2,109.34 = 856.42 : x
2. Step 2: Convert to fraction form
   1,528.56/2,109.34 = 856.42/x
3. Step 3: Cross multiply
   1,528.56x = 2,109.34 × 856.42
4. Step 4: Simplify right side
   1,528.56x = 1,806,483.10
5. Step 5: Solve for x
   x = 1,806,483.10/1,528.56
6. Step 6: Final answer
   x = 1,181.82