Finding the Fourth Proportional to 7,649.50, 10,540.15 and 7,123.58

Step by Step Solution

1. Step 1: Write the proportion equation
   7,649.50 : 10,540.15 = 7,123.58 : x
2. Step 2: Convert to fraction form
   7,649.50/10,540.15 = 7,123.58/x
3. Step 3: Cross multiply
   7,649.50x = 10,540.15 × 7,123.58
4. Step 4: Simplify right side
   7,649.50x = 75,083,601.74
5. Step 5: Solve for x
   x = 75,083,601.74/7,649.50
6. Step 6: Final answer
   x = 9,815.49