Finding the Fourth Proportional to 72,072.42, 99,455.76 and 40,243.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,072.42 : 99,455.76 = 40,243.32 : x
2. Step 2: Convert to fraction form
   72,072.42/99,455.76 = 40,243.32/x
3. Step 3: Cross multiply
   72,072.42x = 99,455.76 × 40,243.32
4. Step 4: Simplify right side
   72,072.42x = 4,002,429,975.52
5. Step 5: Solve for x
   x = 4,002,429,975.52/72,072.42
6. Step 6: Final answer
   x = 55,533.45