Finding the Fourth Proportional to 73,965.72, 102,072.78 and 40,431.72

Step by Step Solution

1. Step 1: Write the proportion equation
   73,965.72 : 102,072.78 = 40,431.72 : x
2. Step 2: Convert to fraction form
   73,965.72/102,072.78 = 40,431.72/x
3. Step 3: Cross multiply
   73,965.72x = 102,072.78 × 40,431.72
4. Step 4: Simplify right side
   73,965.72x = 4,126,978,060.58
5. Step 5: Solve for x
   x = 4,126,978,060.58/73,965.72
6. Step 6: Final answer
   x = 55,795.82