Finding the Fourth Proportional to 1,258.01, 1,886.49 and 641.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.01 : 1,886.49 = 641.37 : x
2. Step 2: Convert to fraction form
   1,258.01/1,886.49 = 641.37/x
3. Step 3: Cross multiply
   1,258.01x = 1,886.49 × 641.37
4. Step 4: Simplify right side
   1,258.01x = 1,209,934.55
5. Step 5: Solve for x
   x = 1,209,934.55/1,258.01
6. Step 6: Final answer
   x = 961.79