Finding the Fourth Proportional to 9,405.72, 12,978.18 and 6,047.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.72 : 12,978.18 = 6,047.40 : x
2. Step 2: Convert to fraction form
   9,405.72/12,978.18 = 6,047.40/x
3. Step 3: Cross multiply
   9,405.72x = 12,978.18 × 6,047.40
4. Step 4: Simplify right side
   9,405.72x = 78,484,245.73
5. Step 5: Solve for x
   x = 78,484,245.73/9,405.72
6. Step 6: Final answer
   x = 8,344.31