Finding the Fourth Proportional to 2,012.15, 3,018.21 and 551.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.15 : 3,018.21 = 551.31 : x
2. Step 2: Convert to fraction form
   2,012.15/3,018.21 = 551.31/x
3. Step 3: Cross multiply
   2,012.15x = 3,018.21 × 551.31
4. Step 4: Simplify right side
   2,012.15x = 1,663,969.36
5. Step 5: Solve for x
   x = 1,663,969.36/2,012.15
6. Step 6: Final answer
   x = 826.96