Finding the Fourth Proportional to 2,229.94, 3,319.55 and 2,123.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,229.94 : 3,319.55 = 2,123.80 : x
2. Step 2: Convert to fraction form
   2,229.94/3,319.55 = 2,123.80/x
3. Step 3: Cross multiply
   2,229.94x = 3,319.55 × 2,123.80
4. Step 4: Simplify right side
   2,229.94x = 7,050,060.29
5. Step 5: Solve for x
   x = 7,050,060.29/2,229.94
6. Step 6: Final answer
   x = 3,161.55