Finding the Fourth Proportional to 1,071.50, 1,605.89 and 454.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.50 : 1,605.89 = 454.48 : x
2. Step 2: Convert to fraction form
   1,071.50/1,605.89 = 454.48/x
3. Step 3: Cross multiply
   1,071.50x = 1,605.89 × 454.48
4. Step 4: Simplify right side
   1,071.50x = 729,842.01
5. Step 5: Solve for x
   x = 729,842.01/1,071.50
6. Step 6: Final answer
   x = 681.14