Finding the Fourth Proportional to 1,307.89, 1,959.63 and 648.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.89 : 1,959.63 = 648.89 : x
2. Step 2: Convert to fraction form
   1,307.89/1,959.63 = 648.89/x
3. Step 3: Cross multiply
   1,307.89x = 1,959.63 × 648.89
4. Step 4: Simplify right side
   1,307.89x = 1,271,584.31
5. Step 5: Solve for x
   x = 1,271,584.31/1,307.89
6. Step 6: Final answer
   x = 972.24