Finding the Fourth Proportional to 2,012.98, 2,778.24 and 1,216.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.98 : 2,778.24 = 1,216.96 : x
2. Step 2: Convert to fraction form
   2,012.98/2,778.24 = 1,216.96/x
3. Step 3: Cross multiply
   2,012.98x = 2,778.24 × 1,216.96
4. Step 4: Simplify right side
   2,012.98x = 3,381,006.95
5. Step 5: Solve for x
   x = 3,381,006.95/2,012.98
6. Step 6: Final answer
   x = 1,679.60