Finding the Fourth Proportional to 72,776.50, 109,164.73 and 20,185.99

Step by Step Solution

1. Step 1: Write the proportion equation
   72,776.50 : 109,164.73 = 20,185.99 : x
2. Step 2: Convert to fraction form
   72,776.50/109,164.73 = 20,185.99/x
3. Step 3: Cross multiply
   72,776.50x = 109,164.73 × 20,185.99
4. Step 4: Simplify right side
   72,776.50x = 2,203,598,148.13
5. Step 5: Solve for x
   x = 2,203,598,148.13/72,776.50
6. Step 6: Final answer
   x = 30,278.98