Finding the Fourth Proportional to 1,427.72, 2,141.42 and 453.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.72 : 2,141.42 = 453.89 : x
2. Step 2: Convert to fraction form
   1,427.72/2,141.42 = 453.89/x
3. Step 3: Cross multiply
   1,427.72x = 2,141.42 × 453.89
4. Step 4: Simplify right side
   1,427.72x = 971,972.21
5. Step 5: Solve for x
   x = 971,972.21/1,427.72
6. Step 6: Final answer
   x = 680.79