Finding the Fourth Proportional to 2,625.69, 3,938.60 and 776.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,625.69 : 3,938.60 = 776.81 : x
2. Step 2: Convert to fraction form
   2,625.69/3,938.60 = 776.81/x
3. Step 3: Cross multiply
   2,625.69x = 3,938.60 × 776.81
4. Step 4: Simplify right side
   2,625.69x = 3,059,520.29
5. Step 5: Solve for x
   x = 3,059,520.29/2,625.69
6. Step 6: Final answer
   x = 1,165.23