Finding the Fourth Proportional to 13,859.52, 20,776.56 and 5,087.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,859.52 : 20,776.56 = 5,087.76 : x
2. Step 2: Convert to fraction form
   13,859.52/20,776.56 = 5,087.76/x
3. Step 3: Cross multiply
   13,859.52x = 20,776.56 × 5,087.76
4. Step 4: Simplify right side
   13,859.52x = 105,706,150.91
5. Step 5: Solve for x
   x = 105,706,150.91/13,859.52
6. Step 6: Final answer
   x = 7,626.97