Finding the Fourth Proportional to 7,629.72, 11,387.39 and 7,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,629.72 : 11,387.39 = 7,131.50 : x
2. Step 2: Convert to fraction form
   7,629.72/11,387.39 = 7,131.50/x
3. Step 3: Cross multiply
   7,629.72x = 11,387.39 × 7,131.50
4. Step 4: Simplify right side
   7,629.72x = 81,209,171.79
5. Step 5: Solve for x
   x = 81,209,171.79/7,629.72
6. Step 6: Final answer
   x = 10,643.79