Finding the Fourth Proportional to 1,766.78, 2,438.21 and 1,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,766.78 : 2,438.21 = 1,020.72 : x
2. Step 2: Convert to fraction form
   1,766.78/2,438.21 = 1,020.72/x
3. Step 3: Cross multiply
   1,766.78x = 2,438.21 × 1,020.72
4. Step 4: Simplify right side
   1,766.78x = 2,488,729.71
5. Step 5: Solve for x
   x = 2,488,729.71/1,766.78
6. Step 6: Final answer
   x = 1,408.62