Finding the Fourth Proportional to 10,987.24, 16,486.22 and 5,142.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,987.24 : 16,486.22 = 5,142.76 : x
2. Step 2: Convert to fraction form
   10,987.24/16,486.22 = 5,142.76/x
3. Step 3: Cross multiply
   10,987.24x = 16,486.22 × 5,142.76
4. Step 4: Simplify right side
   10,987.24x = 84,784,672.77
5. Step 5: Solve for x
   x = 84,784,672.77/10,987.24
6. Step 6: Final answer
   x = 7,716.65