Finding the Fourth Proportional to 13,109.60, 19,662.18 and 3,619.64

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.60 : 19,662.18 = 3,619.64 : x
2. Step 2: Convert to fraction form
   13,109.60/19,662.18 = 3,619.64/x
3. Step 3: Cross multiply
   13,109.60x = 19,662.18 × 3,619.64
4. Step 4: Simplify right side
   13,109.60x = 71,170,013.22
5. Step 5: Solve for x
   x = 71,170,013.22/13,109.60
6. Step 6: Final answer
   x = 5,428.85