Finding the Fourth Proportional to 1,458.75, 2,171.69 and 1,438.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,458.75 : 2,171.69 = 1,438.23 : x
2. Step 2: Convert to fraction form
   1,458.75/2,171.69 = 1,438.23/x
3. Step 3: Cross multiply
   1,458.75x = 2,171.69 × 1,438.23
4. Step 4: Simplify right side
   1,458.75x = 3,123,389.71
5. Step 5: Solve for x
   x = 3,123,389.71/1,458.75
6. Step 6: Final answer
   x = 2,141.14