Finding the Fourth Proportional to 10,687.32, 16,026.93 and 5,139.36

Step by Step Solution

1. Step 1: Write the proportion equation
   10,687.32 : 16,026.93 = 5,139.36 : x
2. Step 2: Convert to fraction form
   10,687.32/16,026.93 = 5,139.36/x
3. Step 3: Cross multiply
   10,687.32x = 16,026.93 × 5,139.36
4. Step 4: Simplify right side
   10,687.32x = 82,368,162.96
5. Step 5: Solve for x
   x = 82,368,162.96/10,687.32
6. Step 6: Final answer
   x = 7,707.09