Finding the Fourth Proportional to 12,210.80, 16,820.76 and 10,412.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,210.80 : 16,820.76 = 10,412.42 : x
2. Step 2: Convert to fraction form
   12,210.80/16,820.76 = 10,412.42/x
3. Step 3: Cross multiply
   12,210.80x = 16,820.76 × 10,412.42
4. Step 4: Simplify right side
   12,210.80x = 175,144,859.89
5. Step 5: Solve for x
   x = 175,144,859.89/12,210.80
6. Step 6: Final answer
   x = 14,343.44