Finding the Fourth Proportional to 21,785.76, 30,064.77 and 12,354.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,785.76 : 30,064.77 = 12,354.12 : x
2. Step 2: Convert to fraction form
   21,785.76/30,064.77 = 12,354.12/x
3. Step 3: Cross multiply
   21,785.76x = 30,064.77 × 12,354.12
4. Step 4: Simplify right side
   21,785.76x = 371,423,776.35
5. Step 5: Solve for x
   x = 371,423,776.35/21,785.76
6. Step 6: Final answer
   x = 17,048.92