Finding the Fourth Proportional to 1,085.92, 1,628.84 and 436.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.92 : 1,628.84 = 436.56 : x
2. Step 2: Convert to fraction form
   1,085.92/1,628.84 = 436.56/x
3. Step 3: Cross multiply
   1,085.92x = 1,628.84 × 436.56
4. Step 4: Simplify right side
   1,085.92x = 711,086.39
5. Step 5: Solve for x
   x = 711,086.39/1,085.92
6. Step 6: Final answer
   x = 654.82