Finding the Fourth Proportional to 22,321.23, 30,807.86 and 12,888.51

Step by Step Solution

1. Step 1: Write the proportion equation
   22,321.23 : 30,807.86 = 12,888.51 : x
2. Step 2: Convert to fraction form
   22,321.23/30,807.86 = 12,888.51/x
3. Step 3: Cross multiply
   22,321.23x = 30,807.86 × 12,888.51
4. Step 4: Simplify right side
   22,321.23x = 397,067,411.69
5. Step 5: Solve for x
   x = 397,067,411.69/22,321.23
6. Step 6: Final answer
   x = 17,788.78