Finding the Fourth Proportional to 1,086.16, 1,629.52 and 436.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.16 : 1,629.52 = 436.56 : x
2. Step 2: Convert to fraction form
   1,086.16/1,629.52 = 436.56/x
3. Step 3: Cross multiply
   1,086.16x = 1,629.52 × 436.56
4. Step 4: Simplify right side
   1,086.16x = 711,383.25
5. Step 5: Solve for x
   x = 711,383.25/1,086.16
6. Step 6: Final answer
   x = 654.95