Finding the Fourth Proportional to 1,085.32, 1,628.22 and 436.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.32 : 1,628.22 = 436.60 : x
2. Step 2: Convert to fraction form
   1,085.32/1,628.22 = 436.60/x
3. Step 3: Cross multiply
   1,085.32x = 1,628.22 × 436.60
4. Step 4: Simplify right side
   1,085.32x = 710,880.85
5. Step 5: Solve for x
   x = 710,880.85/1,085.32
6. Step 6: Final answer
   x = 655.00