Finding the Fourth Proportional to 2,077.91, 3,117.15 and 779.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,077.91 : 3,117.15 = 779.25 : x
2. Step 2: Convert to fraction form
   2,077.91/3,117.15 = 779.25/x
3. Step 3: Cross multiply
   2,077.91x = 3,117.15 × 779.25
4. Step 4: Simplify right side
   2,077.91x = 2,429,039.14
5. Step 5: Solve for x
   x = 2,429,039.14/2,077.91
6. Step 6: Final answer
   x = 1,168.98