Finding the Fourth Proportional to 72,019.68, 99,393.75 and 39,760.08

Step by Step Solution

1. Step 1: Write the proportion equation
   72,019.68 : 99,393.75 = 39,760.08 : x
2. Step 2: Convert to fraction form
   72,019.68/99,393.75 = 39,760.08/x
3. Step 3: Cross multiply
   72,019.68x = 99,393.75 × 39,760.08
4. Step 4: Simplify right side
   72,019.68x = 3,951,903,451.50
5. Step 5: Solve for x
   x = 3,951,903,451.50/72,019.68
6. Step 6: Final answer
   x = 54,872.55