Finding the Fourth Proportional to 1,111.05, 1,665.42 and 452.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.05 : 1,665.42 = 452.65 : x
2. Step 2: Convert to fraction form
   1,111.05/1,665.42 = 452.65/x
3. Step 3: Cross multiply
   1,111.05x = 1,665.42 × 452.65
4. Step 4: Simplify right side
   1,111.05x = 753,849.90
5. Step 5: Solve for x
   x = 753,849.90/1,111.05
6. Step 6: Final answer
   x = 678.50