Finding the Fourth Proportional to 9,621.15, 14,436.72 and 7,280.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.15 : 14,436.72 = 7,280.45 : x
2. Step 2: Convert to fraction form
   9,621.15/14,436.72 = 7,280.45/x
3. Step 3: Cross multiply
   9,621.15x = 14,436.72 × 7,280.45
4. Step 4: Simplify right side
   9,621.15x = 105,105,818.12
5. Step 5: Solve for x
   x = 105,105,818.12/9,621.15
6. Step 6: Final answer
   x = 10,924.45