Finding the Fourth Proportional to 72,019.49, 99,386.90 and 39,754.11

Step by Step Solution

1. Step 1: Write the proportion equation
   72,019.49 : 99,386.90 = 39,754.11 : x
2. Step 2: Convert to fraction form
   72,019.49/99,386.90 = 39,754.11/x
3. Step 3: Cross multiply
   72,019.49x = 99,386.90 × 39,754.11
4. Step 4: Simplify right side
   72,019.49x = 3,951,037,556.39
5. Step 5: Solve for x
   x = 3,951,037,556.39/72,019.49
6. Step 6: Final answer
   x = 54,860.67