Finding the Fourth Proportional to 9,150.89, 12,628.67 and 5,172.17

Step by Step Solution

1. Step 1: Write the proportion equation
   9,150.89 : 12,628.67 = 5,172.17 : x
2. Step 2: Convert to fraction form
   9,150.89/12,628.67 = 5,172.17/x
3. Step 3: Cross multiply
   9,150.89x = 12,628.67 × 5,172.17
4. Step 4: Simplify right side
   9,150.89x = 65,317,539.11
5. Step 5: Solve for x
   x = 65,317,539.11/9,150.89
6. Step 6: Final answer
   x = 7,137.84