Finding the Fourth Proportional to 190,688.88, 285,992.82 and 72,318.72

Step by Step Solution

1. Step 1: Write the proportion equation
   190,688.88 : 285,992.82 = 72,318.72 : x
2. Step 2: Convert to fraction form
   190,688.88/285,992.82 = 72,318.72/x
3. Step 3: Cross multiply
   190,688.88x = 285,992.82 × 72,318.72
4. Step 4: Simplify right side
   190,688.88x = 20,682,634,671.59
5. Step 5: Solve for x
   x = 20,682,634,671.59/190,688.88
6. Step 6: Final answer
   x = 108,462.72