Finding the Fourth Proportional to 72,955.50, 100,678.59 and 39,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,955.50 : 100,678.59 = 39,421.50 : x
2. Step 2: Convert to fraction form
   72,955.50/100,678.59 = 39,421.50/x
3. Step 3: Cross multiply
   72,955.50x = 100,678.59 × 39,421.50
4. Step 4: Simplify right side
   72,955.50x = 3,968,901,035.69
5. Step 5: Solve for x
   x = 3,968,901,035.69/72,955.50
6. Step 6: Final answer
   x = 54,401.67