Finding the Fourth Proportional to 72,589.76, 108,874.72 and 19,991.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,589.76 : 108,874.72 = 19,991.68 : x
2. Step 2: Convert to fraction form
   72,589.76/108,874.72 = 19,991.68/x
3. Step 3: Cross multiply
   72,589.76x = 108,874.72 × 19,991.68
4. Step 4: Simplify right side
   72,589.76x = 2,176,588,562.33
5. Step 5: Solve for x
   x = 2,176,588,562.33/72,589.76
6. Step 6: Final answer
   x = 29,984.79