Finding the Fourth Proportional to 1,258.29, 1,886.72 and 487.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.29 : 1,886.72 = 487.89 : x
2. Step 2: Convert to fraction form
   1,258.29/1,886.72 = 487.89/x
3. Step 3: Cross multiply
   1,258.29x = 1,886.72 × 487.89
4. Step 4: Simplify right side
   1,258.29x = 920,509.38
5. Step 5: Solve for x
   x = 920,509.38/1,258.29
6. Step 6: Final answer
   x = 731.56