Finding the Fourth Proportional to 72,387.27, 108,085.79 and 64,842.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72,387.27 : 108,085.79 = 64,842.12 : x
2. Step 2: Convert to fraction form
   72,387.27/108,085.79 = 64,842.12/x
3. Step 3: Cross multiply
   72,387.27x = 108,085.79 × 64,842.12
4. Step 4: Simplify right side
   72,387.27x = 7,008,511,927.58
5. Step 5: Solve for x
   x = 7,008,511,927.58/72,387.27
6. Step 6: Final answer
   x = 96,819.67