Finding the Fourth Proportional to 9,151.48, 12,628.91 and 5,172.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,151.48 : 12,628.91 = 5,172.46 : x
2. Step 2: Convert to fraction form
   9,151.48/12,628.91 = 5,172.46/x
3. Step 3: Cross multiply
   9,151.48x = 12,628.91 × 5,172.46
4. Step 4: Simplify right side
   9,151.48x = 65,322,513.18
5. Step 5: Solve for x
   x = 65,322,513.18/9,151.48
6. Step 6: Final answer
   x = 7,137.92