Finding the Fourth Proportional to 2,626.31, 3,938.72 and 776.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.31 : 3,938.72 = 776.99 : x
2. Step 2: Convert to fraction form
   2,626.31/3,938.72 = 776.99/x
3. Step 3: Cross multiply
   2,626.31x = 3,938.72 × 776.99
4. Step 4: Simplify right side
   2,626.31x = 3,060,322.47
5. Step 5: Solve for x
   x = 3,060,322.47/2,626.31
6. Step 6: Final answer
   x = 1,165.26