Finding the Fourth Proportional to 9,621.45, 13,280.63 and 5,644.17

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.45 : 13,280.63 = 5,644.17 : x
2. Step 2: Convert to fraction form
   9,621.45/13,280.63 = 5,644.17/x
3. Step 3: Cross multiply
   9,621.45x = 13,280.63 × 5,644.17
4. Step 4: Simplify right side
   9,621.45x = 74,958,105.21
5. Step 5: Solve for x
   x = 74,958,105.21/9,621.45
6. Step 6: Final answer
   x = 7,790.73