Finding the Fourth Proportional to 20,483.99, 30,719.15 and 8,000.78

Step by Step Solution

1. Step 1: Write the proportion equation
   20,483.99 : 30,719.15 = 8,000.78 : x
2. Step 2: Convert to fraction form
   20,483.99/30,719.15 = 8,000.78/x
3. Step 3: Cross multiply
   20,483.99x = 30,719.15 × 8,000.78
4. Step 4: Simplify right side
   20,483.99x = 245,776,997.34
5. Step 5: Solve for x
   x = 245,776,997.34/20,483.99
6. Step 6: Final answer
   x = 11,998.49