Finding the Fourth Proportional to 2,627.52, 3,939.90 and 778.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,627.52 : 3,939.90 = 778.41 : x
2. Step 2: Convert to fraction form
   2,627.52/3,939.90 = 778.41/x
3. Step 3: Cross multiply
   2,627.52x = 3,939.90 × 778.41
4. Step 4: Simplify right side
   2,627.52x = 3,066,857.56
5. Step 5: Solve for x
   x = 3,066,857.56/2,627.52
6. Step 6: Final answer
   x = 1,167.21