Finding the Fourth Proportional to 1,085.46, 1,628.33 and 436.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.46 : 1,628.33 = 436.05 : x
2. Step 2: Convert to fraction form
   1,085.46/1,628.33 = 436.05/x
3. Step 3: Cross multiply
   1,085.46x = 1,628.33 × 436.05
4. Step 4: Simplify right side
   1,085.46x = 710,031.12
5. Step 5: Solve for x
   x = 710,031.12/1,085.46
6. Step 6: Final answer
   x = 654.13