Finding the Fourth Proportional to 2,625.96, 3,939.71 and 777.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,625.96 : 3,939.71 = 777.12 : x
2. Step 2: Convert to fraction form
   2,625.96/3,939.71 = 777.12/x
3. Step 3: Cross multiply
   2,625.96x = 3,939.71 × 777.12
4. Step 4: Simplify right side
   2,625.96x = 3,061,627.44
5. Step 5: Solve for x
   x = 3,061,627.44/2,625.96
6. Step 6: Final answer
   x = 1,165.91