Finding the Fourth Proportional to 9,399.08, 12,969.78 and 5,621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.08 : 12,969.78 = 5,621.50 : x
2. Step 2: Convert to fraction form
   9,399.08/12,969.78 = 5,621.50/x
3. Step 3: Cross multiply
   9,399.08x = 12,969.78 × 5,621.50
4. Step 4: Simplify right side
   9,399.08x = 72,909,618.27
5. Step 5: Solve for x
   x = 72,909,618.27/9,399.08
6. Step 6: Final answer
   x = 7,757.10