Finding the Fourth Proportional to 1,300.50, 1,950.84 and 642.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.50 : 1,950.84 = 642.72 : x
2. Step 2: Convert to fraction form
   1,300.50/1,950.84 = 642.72/x
3. Step 3: Cross multiply
   1,300.50x = 1,950.84 × 642.72
4. Step 4: Simplify right side
   1,300.50x = 1,253,843.88
5. Step 5: Solve for x
   x = 1,253,843.88/1,300.50
6. Step 6: Final answer
   x = 964.12