Finding the Fourth Proportional to 1,008.75, 1,511.82 and 453.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.75 : 1,511.82 = 453.05 : x
2. Step 2: Convert to fraction form
   1,008.75/1,511.82 = 453.05/x
3. Step 3: Cross multiply
   1,008.75x = 1,511.82 × 453.05
4. Step 4: Simplify right side
   1,008.75x = 684,933.69
5. Step 5: Solve for x
   x = 684,933.69/1,008.75
6. Step 6: Final answer
   x = 678.99