Finding the Fourth Proportional to 12,889.52, 19,179.88 and 12,845.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,889.52 : 19,179.88 = 12,845.78 : x
2. Step 2: Convert to fraction form
   12,889.52/19,179.88 = 12,845.78/x
3. Step 3: Cross multiply
   12,889.52x = 19,179.88 × 12,845.78
4. Step 4: Simplify right side
   12,889.52x = 246,380,518.91
5. Step 5: Solve for x
   x = 246,380,518.91/12,889.52
6. Step 6: Final answer
   x = 19,114.79