Finding the Fourth Proportional to 1,111.93, 1,668.48 and 454.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.93 : 1,668.48 = 454.29 : x
2. Step 2: Convert to fraction form
   1,111.93/1,668.48 = 454.29/x
3. Step 3: Cross multiply
   1,111.93x = 1,668.48 × 454.29
4. Step 4: Simplify right side
   1,111.93x = 757,973.78
5. Step 5: Solve for x
   x = 757,973.78/1,111.93
6. Step 6: Final answer
   x = 681.67