Finding the Fourth Proportional to 2,012.01, 3,017.55 and 778.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.01 : 3,017.55 = 778.78 : x
2. Step 2: Convert to fraction form
   2,012.01/3,017.55 = 778.78/x
3. Step 3: Cross multiply
   2,012.01x = 3,017.55 × 778.78
4. Step 4: Simplify right side
   2,012.01x = 2,350,007.59
5. Step 5: Solve for x
   x = 2,350,007.59/2,012.01
6. Step 6: Final answer
   x = 1,167.99