Finding the Fourth Proportional to 1,636.84, 2,259.30 and 1,007.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.84 : 2,259.30 = 1,007.56 : x
2. Step 2: Convert to fraction form
   1,636.84/2,259.30 = 1,007.56/x
3. Step 3: Cross multiply
   1,636.84x = 2,259.30 × 1,007.56
4. Step 4: Simplify right side
   1,636.84x = 2,276,380.31
5. Step 5: Solve for x
   x = 2,276,380.31/1,636.84
6. Step 6: Final answer
   x = 1,390.72