Finding the Fourth Proportional to 1,636.89, 2,449.94 and 1,021.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.89 : 2,449.94 = 1,021.05 : x
2. Step 2: Convert to fraction form
   1,636.89/2,449.94 = 1,021.05/x
3. Step 3: Cross multiply
   1,636.89x = 2,449.94 × 1,021.05
4. Step 4: Simplify right side
   1,636.89x = 2,501,506.13
5. Step 5: Solve for x
   x = 2,501,506.13/1,636.89
6. Step 6: Final answer
   x = 1,528.21