Finding the Fourth Proportional to 1,086.57, 1,629.72 and 436.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.57 : 1,629.72 = 436.82 : x
2. Step 2: Convert to fraction form
   1,086.57/1,629.72 = 436.82/x
3. Step 3: Cross multiply
   1,086.57x = 1,629.72 × 436.82
4. Step 4: Simplify right side
   1,086.57x = 711,886.14
5. Step 5: Solve for x
   x = 711,886.14/1,086.57
6. Step 6: Final answer
   x = 655.17