Finding the Fourth Proportional to 9,151.57, 12,629.93 and 5,172.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,151.57 : 12,629.93 = 5,172.94 : x
2. Step 2: Convert to fraction form
   9,151.57/12,629.93 = 5,172.94/x
3. Step 3: Cross multiply
   9,151.57x = 12,629.93 × 5,172.94
4. Step 4: Simplify right side
   9,151.57x = 65,333,824.50
5. Step 5: Solve for x
   x = 65,333,824.50/9,151.57
6. Step 6: Final answer
   x = 7,139.08