Finding the Fourth Proportional to 1,636.83, 2,457.72 and 817.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.83 : 2,457.72 = 817.92 : x
2. Step 2: Convert to fraction form
   1,636.83/2,457.72 = 817.92/x
3. Step 3: Cross multiply
   1,636.83x = 2,457.72 × 817.92
4. Step 4: Simplify right side
   1,636.83x = 2,010,218.34
5. Step 5: Solve for x
   x = 2,010,218.34/1,636.83
6. Step 6: Final answer
   x = 1,228.12