Finding the Fourth Proportional to 72,017.76, 99,386.58 and 40,185.96

Step by Step Solution

1. Step 1: Write the proportion equation
   72,017.76 : 99,386.58 = 40,185.96 : x
2. Step 2: Convert to fraction form
   72,017.76/99,386.58 = 40,185.96/x
3. Step 3: Cross multiply
   72,017.76x = 99,386.58 × 40,185.96
4. Step 4: Simplify right side
   72,017.76x = 3,993,945,128.42
5. Step 5: Solve for x
   x = 3,993,945,128.42/72,017.76
6. Step 6: Final answer
   x = 55,457.78