Finding the Fourth Proportional to 1,636.82, 2,259.76 and 1,007.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.82 : 2,259.76 = 1,007.60 : x
2. Step 2: Convert to fraction form
   1,636.82/2,259.76 = 1,007.60/x
3. Step 3: Cross multiply
   1,636.82x = 2,259.76 × 1,007.60
4. Step 4: Simplify right side
   1,636.82x = 2,276,934.18
5. Step 5: Solve for x
   x = 2,276,934.18/1,636.82
6. Step 6: Final answer
   x = 1,391.07