Finding the Fourth Proportional to 1,086.32, 1,628.73 and 436.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.32 : 1,628.73 = 436.70 : x
2. Step 2: Convert to fraction form
   1,086.32/1,628.73 = 436.70/x
3. Step 3: Cross multiply
   1,086.32x = 1,628.73 × 436.70
4. Step 4: Simplify right side
   1,086.32x = 711,266.39
5. Step 5: Solve for x
   x = 711,266.39/1,086.32
6. Step 6: Final answer
   x = 654.75