Finding the Fourth Proportional to 2,145.40, 3,238.69 and 2,123.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.40 : 3,238.69 = 2,123.80 : x
2. Step 2: Convert to fraction form
   2,145.40/3,238.69 = 2,123.80/x
3. Step 3: Cross multiply
   2,145.40x = 3,238.69 × 2,123.80
4. Step 4: Simplify right side
   2,145.40x = 6,878,329.82
5. Step 5: Solve for x
   x = 6,878,329.82/2,145.40
6. Step 6: Final answer
   x = 3,206.08