Finding the Fourth Proportional to 20,263, 30,389.82 and 7,778.92

Step by Step Solution

1. Step 1: Write the proportion equation
   20,263 : 30,389.82 = 7,778.92 : x
2. Step 2: Convert to fraction form
   20,263/30,389.82 = 7,778.92/x
3. Step 3: Cross multiply
   20,263x = 30,389.82 × 7,778.92
4. Step 4: Simplify right side
   20,263x = 236,399,978.59
5. Step 5: Solve for x
   x = 236,399,978.59/20,263
6. Step 6: Final answer
   x = 11,666.58