Finding the Fourth Proportional to 14,638.88, 21,961.38 and 4,778.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,638.88 : 21,961.38 = 4,778.72 : x
2. Step 2: Convert to fraction form
   14,638.88/21,961.38 = 4,778.72/x
3. Step 3: Cross multiply
   14,638.88x = 21,961.38 × 4,778.72
4. Step 4: Simplify right side
   14,638.88x = 104,947,285.83
5. Step 5: Solve for x
   x = 104,947,285.83/14,638.88
6. Step 6: Final answer
   x = 7,169.08