Finding the Fourth Proportional to 1,086.58, 1,628.25 and 436.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.58 : 1,628.25 = 436.96 : x
2. Step 2: Convert to fraction form
   1,086.58/1,628.25 = 436.96/x
3. Step 3: Cross multiply
   1,086.58x = 1,628.25 × 436.96
4. Step 4: Simplify right side
   1,086.58x = 711,480.12
5. Step 5: Solve for x
   x = 711,480.12/1,086.58
6. Step 6: Final answer
   x = 654.79