Finding the Fourth Proportional to 1,645.82, 2,275.62 and 1,438.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.82 : 2,275.62 = 1,438.34 : x
2. Step 2: Convert to fraction form
   1,645.82/2,275.62 = 1,438.34/x
3. Step 3: Cross multiply
   1,645.82x = 2,275.62 × 1,438.34
4. Step 4: Simplify right side
   1,645.82x = 3,273,115.27
5. Step 5: Solve for x
   x = 3,273,115.27/1,645.82
6. Step 6: Final answer
   x = 1,988.74