Finding the Fourth Proportional to 9,145.21, 12,620.36 and 5,166.32

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.21 : 12,620.36 = 5,166.32 : x
2. Step 2: Convert to fraction form
   9,145.21/12,620.36 = 5,166.32/x
3. Step 3: Cross multiply
   9,145.21x = 12,620.36 × 5,166.32
4. Step 4: Simplify right side
   9,145.21x = 65,200,772.30
5. Step 5: Solve for x
   x = 65,200,772.30/9,145.21
6. Step 6: Final answer
   x = 7,129.50