Finding the Fourth Proportional to 12,738.29, 18,978.30 and 12,110.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.29 : 18,978.30 = 12,110.91 : x
2. Step 2: Convert to fraction form
   12,738.29/18,978.30 = 12,110.91/x
3. Step 3: Cross multiply
   12,738.29x = 18,978.30 × 12,110.91
4. Step 4: Simplify right side
   12,738.29x = 229,844,483.25
5. Step 5: Solve for x
   x = 229,844,483.25/12,738.29
6. Step 6: Final answer
   x = 18,043.59