Finding the Fourth Proportional to 9,145.40, 12,620.49 and 5,166.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.40 : 12,620.49 = 5,166.23 : x
2. Step 2: Convert to fraction form
   9,145.40/12,620.49 = 5,166.23/x
3. Step 3: Cross multiply
   9,145.40x = 12,620.49 × 5,166.23
4. Step 4: Simplify right side
   9,145.40x = 65,200,354.05
5. Step 5: Solve for x
   x = 65,200,354.05/9,145.40
6. Step 6: Final answer
   x = 7,129.31