Finding the Fourth Proportional to 9,145.89, 12,621.87 and 5,167.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.89 : 12,621.87 = 5,167.62 : x
2. Step 2: Convert to fraction form
   9,145.89/12,621.87 = 5,167.62/x
3. Step 3: Cross multiply
   9,145.89x = 12,621.87 × 5,167.62
4. Step 4: Simplify right side
   9,145.89x = 65,225,027.85
5. Step 5: Solve for x
   x = 65,225,027.85/9,145.89
6. Step 6: Final answer
   x = 7,131.62