Finding the Fourth Proportional to 3,870.78, 5,806.08 and 949.07

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.78 : 5,806.08 = 949.07 : x
2. Step 2: Convert to fraction form
   3,870.78/5,806.08 = 949.07/x
3. Step 3: Cross multiply
   3,870.78x = 5,806.08 × 949.07
4. Step 4: Simplify right side
   3,870.78x = 5,510,347.32
5. Step 5: Solve for x
   x = 5,510,347.32/3,870.78
6. Step 6: Final answer
   x = 1,423.58