Finding the Fourth Proportional to 10,638.91, 15,968.21 and 5,377.62

Step by Step Solution

1. Step 1: Write the proportion equation
   10,638.91 : 15,968.21 = 5,377.62 : x
2. Step 2: Convert to fraction form
   10,638.91/15,968.21 = 5,377.62/x
3. Step 3: Cross multiply
   10,638.91x = 15,968.21 × 5,377.62
4. Step 4: Simplify right side
   10,638.91x = 85,870,998.45
5. Step 5: Solve for x
   x = 85,870,998.45/10,638.91
6. Step 6: Final answer
   x = 8,071.41