Finding the Fourth Proportional to 1,304.47, 1,955.69 and 645.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.47 : 1,955.69 = 645.89 : x
2. Step 2: Convert to fraction form
   1,304.47/1,955.69 = 645.89/x
3. Step 3: Cross multiply
   1,304.47x = 1,955.69 × 645.89
4. Step 4: Simplify right side
   1,304.47x = 1,263,157.38
5. Step 5: Solve for x
   x = 1,263,157.38/1,304.47
6. Step 6: Final answer
   x = 968.33