Finding the Fourth Proportional to 12,738.89, 19,109.34 and 4,415.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.89 : 19,109.34 = 4,415.54 : x
2. Step 2: Convert to fraction form
   12,738.89/19,109.34 = 4,415.54/x
3. Step 3: Cross multiply
   12,738.89x = 19,109.34 × 4,415.54
4. Step 4: Simplify right side
   12,738.89x = 84,377,959.60
5. Step 5: Solve for x
   x = 84,377,959.60/12,738.89
6. Step 6: Final answer
   x = 6,623.65