Finding the Fourth Proportional to 72,128.44, 99,535.42 and 40,297.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72,128.44 : 99,535.42 = 40,297.56 : x
2. Step 2: Convert to fraction form
   72,128.44/99,535.42 = 40,297.56/x
3. Step 3: Cross multiply
   72,128.44x = 99,535.42 × 40,297.56
4. Step 4: Simplify right side
   72,128.44x = 4,011,034,559.58
5. Step 5: Solve for x
   x = 4,011,034,559.58/72,128.44
6. Step 6: Final answer
   x = 55,609.61