Finding the Fourth Proportional to 19,976.10, 29,906.55 and 12,200.10

Step by Step Solution

1. Step 1: Write the proportion equation
   19,976.10 : 29,906.55 = 12,200.10 : x
2. Step 2: Convert to fraction form
   19,976.10/29,906.55 = 12,200.10/x
3. Step 3: Cross multiply
   19,976.10x = 29,906.55 × 12,200.10
4. Step 4: Simplify right side
   19,976.10x = 364,862,900.66
5. Step 5: Solve for x
   x = 364,862,900.66/19,976.10
6. Step 6: Final answer
   x = 18,264.97