Finding the Fourth Proportional to 72,016.02, 99,386.88 and 40,185.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,016.02 : 99,386.88 = 40,185.60 : x
2. Step 2: Convert to fraction form
   72,016.02/99,386.88 = 40,185.60/x
3. Step 3: Cross multiply
   72,016.02x = 99,386.88 × 40,185.60
4. Step 4: Simplify right side
   72,016.02x = 3,993,921,404.93
5. Step 5: Solve for x
   x = 3,993,921,404.93/72,016.02
6. Step 6: Final answer
   x = 55,458.79