Finding the Fourth Proportional to 7,628.72, 11,385.89 and 7,130.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,628.72 : 11,385.89 = 7,130.50 : x
2. Step 2: Convert to fraction form
   7,628.72/11,385.89 = 7,130.50/x
3. Step 3: Cross multiply
   7,628.72x = 11,385.89 × 7,130.50
4. Step 4: Simplify right side
   7,628.72x = 81,187,058.45
5. Step 5: Solve for x
   x = 81,187,058.45/7,628.72
6. Step 6: Final answer
   x = 10,642.29