Finding the Fourth Proportional to 1,636.64, 2,449.56 and 1,020.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.64 : 2,449.56 = 1,020.80 : x
2. Step 2: Convert to fraction form
   1,636.64/2,449.56 = 1,020.80/x
3. Step 3: Cross multiply
   1,636.64x = 2,449.56 × 1,020.80
4. Step 4: Simplify right side
   1,636.64x = 2,500,510.85
5. Step 5: Solve for x
   x = 2,500,510.85/1,636.64
6. Step 6: Final answer
   x = 1,527.83