Finding the Fourth Proportional to 9,180.72, 12,636.72 and 7,672.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,180.72 : 12,636.72 = 7,672.08 : x
2. Step 2: Convert to fraction form
   9,180.72/12,636.72 = 7,672.08/x
3. Step 3: Cross multiply
   9,180.72x = 12,636.72 × 7,672.08
4. Step 4: Simplify right side
   9,180.72x = 96,949,926.78
5. Step 5: Solve for x
   x = 96,949,926.78/9,180.72
6. Step 6: Final answer
   x = 10,560.17