Finding the Fourth Proportional to 10,721.35, 16,071.38 and 5,089.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,721.35 : 16,071.38 = 5,089.15 : x
2. Step 2: Convert to fraction form
   10,721.35/16,071.38 = 5,089.15/x
3. Step 3: Cross multiply
   10,721.35x = 16,071.38 × 5,089.15
4. Step 4: Simplify right side
   10,721.35x = 81,789,557.72
5. Step 5: Solve for x
   x = 81,789,557.72/10,721.35
6. Step 6: Final answer
   x = 7,628.67