Finding the Fourth Proportional to 2,211.80, 3,315.89 and 1,224.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.80 : 3,315.89 = 1,224.57 : x
2. Step 2: Convert to fraction form
   2,211.80/3,315.89 = 1,224.57/x
3. Step 3: Cross multiply
   2,211.80x = 3,315.89 × 1,224.57
4. Step 4: Simplify right side
   2,211.80x = 4,060,539.42
5. Step 5: Solve for x
   x = 4,060,539.42/2,211.80
6. Step 6: Final answer
   x = 1,835.85