Finding the Fourth Proportional to 72,017.21, 99,383.81 and 40,186.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72,017.21 : 99,383.81 = 40,186.10 : x
2. Step 2: Convert to fraction form
   72,017.21/99,383.81 = 40,186.10/x
3. Step 3: Cross multiply
   72,017.21x = 99,383.81 × 40,186.10
4. Step 4: Simplify right side
   72,017.21x = 3,993,847,774.57
5. Step 5: Solve for x
   x = 3,993,847,774.57/72,017.21
6. Step 6: Final answer
   x = 55,456.85