Finding the Fourth Proportional to 6,620.96, 9,926.63 and 3,109.16

Step by Step Solution

1. Step 1: Write the proportion equation
   6,620.96 : 9,926.63 = 3,109.16 : x
2. Step 2: Convert to fraction form
   6,620.96/9,926.63 = 3,109.16/x
3. Step 3: Cross multiply
   6,620.96x = 9,926.63 × 3,109.16
4. Step 4: Simplify right side
   6,620.96x = 30,863,513.52
5. Step 5: Solve for x
   x = 30,863,513.52/6,620.96
6. Step 6: Final answer
   x = 4,661.48