Finding the Fourth Proportional to 9,145.45, 12,621.75 and 5,166.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.45 : 12,621.75 = 5,166.82 : x
2. Step 2: Convert to fraction form
   9,145.45/12,621.75 = 5,166.82/x
3. Step 3: Cross multiply
   9,145.45x = 12,621.75 × 5,166.82
4. Step 4: Simplify right side
   9,145.45x = 65,214,284.50
5. Step 5: Solve for x
   x = 65,214,284.50/9,145.45
6. Step 6: Final answer
   x = 7,130.79