Finding the Fourth Proportional to 72,040.32, 99,406.46 and 40,210.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72,040.32 : 99,406.46 = 40,210.56 : x
2. Step 2: Convert to fraction form
   72,040.32/99,406.46 = 40,210.56/x
3. Step 3: Cross multiply
   72,040.32x = 99,406.46 × 40,210.56
4. Step 4: Simplify right side
   72,040.32x = 3,997,189,424.22
5. Step 5: Solve for x
   x = 3,997,189,424.22/72,040.32
6. Step 6: Final answer
   x = 55,485.45