Finding the Fourth Proportional to 9,145.83, 12,622.27 and 5,167.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.83 : 12,622.27 = 5,167.20 : x
2. Step 2: Convert to fraction form
   9,145.83/12,622.27 = 5,167.20/x
3. Step 3: Cross multiply
   9,145.83x = 12,622.27 × 5,167.20
4. Step 4: Simplify right side
   9,145.83x = 65,221,793.54
5. Step 5: Solve for x
   x = 65,221,793.54/9,145.83
6. Step 6: Final answer
   x = 7,131.31