Finding the Fourth Proportional to 1,428.34, 2,142.82 and 454.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.34 : 2,142.82 = 454.52 : x
2. Step 2: Convert to fraction form
   1,428.34/2,142.82 = 454.52/x
3. Step 3: Cross multiply
   1,428.34x = 2,142.82 × 454.52
4. Step 4: Simplify right side
   1,428.34x = 973,954.55
5. Step 5: Solve for x
   x = 973,954.55/1,428.34
6. Step 6: Final answer
   x = 681.88