Finding the Fourth Proportional to 2,077.96, 3,117 and 779.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,077.96 : 3,117 = 779.17 : x
2. Step 2: Convert to fraction form
   2,077.96/3,117 = 779.17/x
3. Step 3: Cross multiply
   2,077.96x = 3,117 × 779.17
4. Step 4: Simplify right side
   2,077.96x = 2,428,672.89
5. Step 5: Solve for x
   x = 2,428,672.89/2,077.96
6. Step 6: Final answer
   x = 1,168.78