Finding the Fourth Proportional to 9,605.76, 14,405.40 and 4,920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,605.76 : 14,405.40 = 4,920.72 : x
2. Step 2: Convert to fraction form
   9,605.76/14,405.40 = 4,920.72/x
3. Step 3: Cross multiply
   9,605.76x = 14,405.40 × 4,920.72
4. Step 4: Simplify right side
   9,605.76x = 70,884,939.89
5. Step 5: Solve for x
   x = 70,884,939.89/9,605.76
6. Step 6: Final answer
   x = 7,379.42