Finding the Fourth Proportional to 2,012.31, 3,016.62 and 780.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.31 : 3,016.62 = 780.54 : x
2. Step 2: Convert to fraction form
   2,012.31/3,016.62 = 780.54/x
3. Step 3: Cross multiply
   2,012.31x = 3,016.62 × 780.54
4. Step 4: Simplify right side
   2,012.31x = 2,354,592.57
5. Step 5: Solve for x
   x = 2,354,592.57/2,012.31
6. Step 6: Final answer
   x = 1,170.09