Finding the Fourth Proportional to 1,085.87, 1,628.29 and 470.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.87 : 1,628.29 = 470.09 : x
2. Step 2: Convert to fraction form
   1,085.87/1,628.29 = 470.09/x
3. Step 3: Cross multiply
   1,085.87x = 1,628.29 × 470.09
4. Step 4: Simplify right side
   1,085.87x = 765,444.55
5. Step 5: Solve for x
   x = 765,444.55/1,085.87
6. Step 6: Final answer
   x = 704.91