Finding the Fourth Proportional to 72,205.60, 99,636.06 and 39,935.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72,205.60 : 99,636.06 = 39,935.09 : x
2. Step 2: Convert to fraction form
   72,205.60/99,636.06 = 39,935.09/x
3. Step 3: Cross multiply
   72,205.60x = 99,636.06 × 39,935.09
4. Step 4: Simplify right side
   72,205.60x = 3,978,975,288.55
5. Step 5: Solve for x
   x = 3,978,975,288.55/72,205.60
6. Step 6: Final answer
   x = 55,106.19