Finding the Fourth Proportional to 12,300.90, 16,982.22 and 8,121.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,300.90 : 16,982.22 = 8,121.30 : x
2. Step 2: Convert to fraction form
   12,300.90/16,982.22 = 8,121.30/x
3. Step 3: Cross multiply
   12,300.90x = 16,982.22 × 8,121.30
4. Step 4: Simplify right side
   12,300.90x = 137,917,703.29
5. Step 5: Solve for x
   x = 137,917,703.29/12,300.90
6. Step 6: Final answer
   x = 11,212.00