Finding the Fourth Proportional to 72,992.72, 100,729.68 and 39,458.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,992.72 : 100,729.68 = 39,458.72 : x
2. Step 2: Convert to fraction form
   72,992.72/100,729.68 = 39,458.72/x
3. Step 3: Cross multiply
   72,992.72x = 100,729.68 × 39,458.72
4. Step 4: Simplify right side
   72,992.72x = 3,974,664,238.81
5. Step 5: Solve for x
   x = 3,974,664,238.81/72,992.72
6. Step 6: Final answer
   x = 54,452.89