Finding the Fourth Proportional to 12,137.56, 18,209.76 and 10,980.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,137.56 : 18,209.76 = 10,980.88 : x
2. Step 2: Convert to fraction form
   12,137.56/18,209.76 = 10,980.88/x
3. Step 3: Cross multiply
   12,137.56x = 18,209.76 × 10,980.88
4. Step 4: Simplify right side
   12,137.56x = 199,959,189.39
5. Step 5: Solve for x
   x = 199,959,189.39/12,137.56
6. Step 6: Final answer
   x = 16,474.41