Finding the Fourth Proportional to 1,072.69, 1,607.79 and 455.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.69 : 1,607.79 = 455.47 : x
2. Step 2: Convert to fraction form
   1,072.69/1,607.79 = 455.47/x
3. Step 3: Cross multiply
   1,072.69x = 1,607.79 × 455.47
4. Step 4: Simplify right side
   1,072.69x = 732,300.11
5. Step 5: Solve for x
   x = 732,300.11/1,072.69
6. Step 6: Final answer
   x = 682.68