Finding the Fourth Proportional to 1,645.03, 2,270.15 and 1,055.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.03 : 2,270.15 = 1,055.69 : x
2. Step 2: Convert to fraction form
   1,645.03/2,270.15 = 1,055.69/x
3. Step 3: Cross multiply
   1,645.03x = 2,270.15 × 1,055.69
4. Step 4: Simplify right side
   1,645.03x = 2,396,570.50
5. Step 5: Solve for x
   x = 2,396,570.50/1,645.03
6. Step 6: Final answer
   x = 1,456.85