Finding the Fourth Proportional to 1,085.66, 1,629.42 and 436.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.66 : 1,629.42 = 436.84 : x
2. Step 2: Convert to fraction form
   1,085.66/1,629.42 = 436.84/x
3. Step 3: Cross multiply
   1,085.66x = 1,629.42 × 436.84
4. Step 4: Simplify right side
   1,085.66x = 711,795.83
5. Step 5: Solve for x
   x = 711,795.83/1,085.66
6. Step 6: Final answer
   x = 655.63