Finding the Fourth Proportional to 72,128.43, 99,535.41 and 40,297.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72,128.43 : 99,535.41 = 40,297.56 : x
2. Step 2: Convert to fraction form
   72,128.43/99,535.41 = 40,297.56/x
3. Step 3: Cross multiply
   72,128.43x = 99,535.41 × 40,297.56
4. Step 4: Simplify right side
   72,128.43x = 4,011,034,156.60
5. Step 5: Solve for x
   x = 4,011,034,156.60/72,128.43
6. Step 6: Final answer
   x = 55,609.61