Finding the Fourth Proportional to 1,085.34, 1,628.31 and 436.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.34 : 1,628.31 = 436.53 : x
2. Step 2: Convert to fraction form
   1,085.34/1,628.31 = 436.53/x
3. Step 3: Cross multiply
   1,085.34x = 1,628.31 × 436.53
4. Step 4: Simplify right side
   1,085.34x = 710,806.16
5. Step 5: Solve for x
   x = 710,806.16/1,085.34
6. Step 6: Final answer
   x = 654.92