Finding the Fourth Proportional to 21,815.51, 30,120.59 and 14,656.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,815.51 : 30,120.59 = 14,656.32 : x
2. Step 2: Convert to fraction form
   21,815.51/30,120.59 = 14,656.32/x
3. Step 3: Cross multiply
   21,815.51x = 30,120.59 × 14,656.32
4. Step 4: Simplify right side
   21,815.51x = 441,457,042.27
5. Step 5: Solve for x
   x = 441,457,042.27/21,815.51
6. Step 6: Final answer
   x = 20,235.93