Finding the Fourth Proportional to 1,528.46, 2,109.09 and 856.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.46 : 2,109.09 = 856.30 : x
2. Step 2: Convert to fraction form
   1,528.46/2,109.09 = 856.30/x
3. Step 3: Cross multiply
   1,528.46x = 2,109.09 × 856.30
4. Step 4: Simplify right side
   1,528.46x = 1,806,013.77
5. Step 5: Solve for x
   x = 1,806,013.77/1,528.46
6. Step 6: Final answer
   x = 1,181.59