Finding the Fourth Proportional to 21,164.58, 29,208.33 and 12,783.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,164.58 : 29,208.33 = 12,783.78 : x
2. Step 2: Convert to fraction form
   21,164.58/29,208.33 = 12,783.78/x
3. Step 3: Cross multiply
   21,164.58x = 29,208.33 × 12,783.78
4. Step 4: Simplify right side
   21,164.58x = 373,392,864.89
5. Step 5: Solve for x
   x = 373,392,864.89/21,164.58
6. Step 6: Final answer
   x = 17,642.35