Finding the Fourth Proportional to 21,782.12, 30,054.70 and 12,826.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,782.12 : 30,054.70 = 12,826.36 : x
2. Step 2: Convert to fraction form
   21,782.12/30,054.70 = 12,826.36/x
3. Step 3: Cross multiply
   21,782.12x = 30,054.70 × 12,826.36
4. Step 4: Simplify right side
   21,782.12x = 385,492,401.89
5. Step 5: Solve for x
   x = 385,492,401.89/21,782.12
6. Step 6: Final answer
   x = 17,697.65