Finding the Fourth Proportional to 10,686.86, 16,008.52 and 8,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,686.86 : 16,008.52 = 8,719.50 : x
2. Step 2: Convert to fraction form
   10,686.86/16,008.52 = 8,719.50/x
3. Step 3: Cross multiply
   10,686.86x = 16,008.52 × 8,719.50
4. Step 4: Simplify right side
   10,686.86x = 139,586,290.14
5. Step 5: Solve for x
   x = 139,586,290.14/10,686.86
6. Step 6: Final answer
   x = 13,061.49