Finding the Fourth Proportional to 72,028.19, 99,404.40 and 39,769.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72,028.19 : 99,404.40 = 39,769.02 : x
2. Step 2: Convert to fraction form
   72,028.19/99,404.40 = 39,769.02/x
3. Step 3: Cross multiply
   72,028.19x = 99,404.40 × 39,769.02
4. Step 4: Simplify right side
   72,028.19x = 3,953,215,571.69
5. Step 5: Solve for x
   x = 3,953,215,571.69/72,028.19
6. Step 6: Final answer
   x = 54,884.29