Finding the Fourth Proportional to 72,801.96, 109,190.76 and 20,216.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,801.96 : 109,190.76 = 20,216.76 : x
2. Step 2: Convert to fraction form
   72,801.96/109,190.76 = 20,216.76/x
3. Step 3: Cross multiply
   72,801.96x = 109,190.76 × 20,216.76
4. Step 4: Simplify right side
   72,801.96x = 2,207,483,389.14
5. Step 5: Solve for x
   x = 2,207,483,389.14/72,801.96
6. Step 6: Final answer
   x = 30,321.76