Finding the Fourth Proportional to 1,085.60, 1,627.92 and 436.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.60 : 1,627.92 = 436.16 : x
2. Step 2: Convert to fraction form
   1,085.60/1,627.92 = 436.16/x
3. Step 3: Cross multiply
   1,085.60x = 1,627.92 × 436.16
4. Step 4: Simplify right side
   1,085.60x = 710,033.59
5. Step 5: Solve for x
   x = 710,033.59/1,085.60
6. Step 6: Final answer
   x = 654.05