Finding the Fourth Proportional to 1,307.48, 1,960.57 and 648.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.48 : 1,960.57 = 648.59 : x
2. Step 2: Convert to fraction form
   1,307.48/1,960.57 = 648.59/x
3. Step 3: Cross multiply
   1,307.48x = 1,960.57 × 648.59
4. Step 4: Simplify right side
   1,307.48x = 1,271,606.10
5. Step 5: Solve for x
   x = 1,271,606.10/1,307.48
6. Step 6: Final answer
   x = 972.56