Finding the Fourth Proportional to 72,145.05, 99,558.26 and 40,314.21

Step by Step Solution

1. Step 1: Write the proportion equation
   72,145.05 : 99,558.26 = 40,314.21 : x
2. Step 2: Convert to fraction form
   72,145.05/99,558.26 = 40,314.21/x
3. Step 3: Cross multiply
   72,145.05x = 99,558.26 × 40,314.21
4. Step 4: Simplify right side
   72,145.05x = 4,013,613,150.59
5. Step 5: Solve for x
   x = 4,013,613,150.59/72,145.05
6. Step 6: Final answer
   x = 55,632.55