Finding the Fourth Proportional to 12,643.88, 18,951.69 and 4,738.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,643.88 : 18,951.69 = 4,738.79 : x
2. Step 2: Convert to fraction form
   12,643.88/18,951.69 = 4,738.79/x
3. Step 3: Cross multiply
   12,643.88x = 18,951.69 × 4,738.79
4. Step 4: Simplify right side
   12,643.88x = 89,808,079.06
5. Step 5: Solve for x
   x = 89,808,079.06/12,643.88
6. Step 6: Final answer
   x = 7,102.89