Finding the Fourth Proportional to 1,086.27, 1,629.86 and 436.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.27 : 1,629.86 = 436.84 : x
2. Step 2: Convert to fraction form
   1,086.27/1,629.86 = 436.84/x
3. Step 3: Cross multiply
   1,086.27x = 1,629.86 × 436.84
4. Step 4: Simplify right side
   1,086.27x = 711,988.04
5. Step 5: Solve for x
   x = 711,988.04/1,086.27
6. Step 6: Final answer
   x = 655.44