Finding the Fourth Proportional to 12,210.83, 18,288.56 and 7,768.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,210.83 : 18,288.56 = 7,768.49 : x
2. Step 2: Convert to fraction form
   12,210.83/18,288.56 = 7,768.49/x
3. Step 3: Cross multiply
   12,210.83x = 18,288.56 × 7,768.49
4. Step 4: Simplify right side
   12,210.83x = 142,074,365.19
5. Step 5: Solve for x
   x = 142,074,365.19/12,210.83
6. Step 6: Final answer
   x = 11,635.12