Finding the Fourth Proportional to 1,258.59, 1,884.83 and 641.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.59 : 1,884.83 = 641.37 : x
2. Step 2: Convert to fraction form
   1,258.59/1,884.83 = 641.37/x
3. Step 3: Cross multiply
   1,258.59x = 1,884.83 × 641.37
4. Step 4: Simplify right side
   1,258.59x = 1,208,870.21
5. Step 5: Solve for x
   x = 1,208,870.21/1,258.59
6. Step 6: Final answer
   x = 960.50