Finding the Fourth Proportional to 2,012.78, 3,018.90 and 551.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.78 : 3,018.90 = 551.99 : x
2. Step 2: Convert to fraction form
   2,012.78/3,018.90 = 551.99/x
3. Step 3: Cross multiply
   2,012.78x = 3,018.90 × 551.99
4. Step 4: Simplify right side
   2,012.78x = 1,666,402.61
5. Step 5: Solve for x
   x = 1,666,402.61/2,012.78
6. Step 6: Final answer
   x = 827.91