Finding the Fourth Proportional to 2,012.51, 3,017.03 and 780.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.51 : 3,017.03 = 780.77 : x
2. Step 2: Convert to fraction form
   2,012.51/3,017.03 = 780.77/x
3. Step 3: Cross multiply
   2,012.51x = 3,017.03 × 780.77
4. Step 4: Simplify right side
   2,012.51x = 2,355,610.15
5. Step 5: Solve for x
   x = 2,355,610.15/2,012.51
6. Step 6: Final answer
   x = 1,170.48