Finding the Fourth Proportional to 9,405.92, 12,987.60 and 7,634.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.92 : 12,987.60 = 7,634.72 : x
2. Step 2: Convert to fraction form
   9,405.92/12,987.60 = 7,634.72/x
3. Step 3: Cross multiply
   9,405.92x = 12,987.60 × 7,634.72
4. Step 4: Simplify right side
   9,405.92x = 99,156,689.47
5. Step 5: Solve for x
   x = 99,156,689.47/9,405.92
6. Step 6: Final answer
   x = 10,541.94