Finding the Fourth Proportional to 1,306.58, 1,960.49 and 648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,306.58 : 1,960.49 = 648.50 : x
2. Step 2: Convert to fraction form
   1,306.58/1,960.49 = 648.50/x
3. Step 3: Cross multiply
   1,306.58x = 1,960.49 × 648.50
4. Step 4: Simplify right side
   1,306.58x = 1,271,369.58
5. Step 5: Solve for x
   x = 1,271,369.58/1,306.58
6. Step 6: Final answer
   x = 973.06