Finding the Fourth Proportional to 14,479.63, 21,721.23 and 5,117.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,479.63 : 21,721.23 = 5,117.72 : x
2. Step 2: Convert to fraction form
   14,479.63/21,721.23 = 5,117.72/x
3. Step 3: Cross multiply
   14,479.63x = 21,721.23 × 5,117.72
4. Step 4: Simplify right side
   14,479.63x = 111,163,064.59
5. Step 5: Solve for x
   x = 111,163,064.59/14,479.63
6. Step 6: Final answer
   x = 7,677.20