Finding the Fourth Proportional to 1,645.57, 2,267.03 and 1,147.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.57 : 2,267.03 = 1,147.31 : x
2. Step 2: Convert to fraction form
   1,645.57/2,267.03 = 1,147.31/x
3. Step 3: Cross multiply
   1,645.57x = 2,267.03 × 1,147.31
4. Step 4: Simplify right side
   1,645.57x = 2,600,986.19
5. Step 5: Solve for x
   x = 2,600,986.19/1,645.57
6. Step 6: Final answer
   x = 1,580.60