Finding the Fourth Proportional to 1,300.87, 1,949.82 and 641.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.87 : 1,949.82 = 641.35 : x
2. Step 2: Convert to fraction form
   1,300.87/1,949.82 = 641.35/x
3. Step 3: Cross multiply
   1,300.87x = 1,949.82 × 641.35
4. Step 4: Simplify right side
   1,300.87x = 1,250,517.06
5. Step 5: Solve for x
   x = 1,250,517.06/1,300.87
6. Step 6: Final answer
   x = 961.29