Finding the Fourth Proportional to 1,091.78, 1,502.87 and 949.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.78 : 1,502.87 = 949.89 : x
2. Step 2: Convert to fraction form
   1,091.78/1,502.87 = 949.89/x
3. Step 3: Cross multiply
   1,091.78x = 1,502.87 × 949.89
4. Step 4: Simplify right side
   1,091.78x = 1,427,556.43
5. Step 5: Solve for x
   x = 1,427,556.43/1,091.78
6. Step 6: Final answer
   x = 1,307.56