Finding the Fourth Proportional to 9,156.48, 12,636.72 and 7,661.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,156.48 : 12,636.72 = 7,661.76 : x
2. Step 2: Convert to fraction form
   9,156.48/12,636.72 = 7,661.76/x
3. Step 3: Cross multiply
   9,156.48x = 12,636.72 × 7,661.76
4. Step 4: Simplify right side
   9,156.48x = 96,819,515.83
5. Step 5: Solve for x
   x = 96,819,515.83/9,156.48
6. Step 6: Final answer
   x = 10,573.88