Finding the Fourth Proportional to 10,016.88, 13,816.35 and 8,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,016.88 : 13,816.35 = 8,128.50 : x
2. Step 2: Convert to fraction form
   10,016.88/13,816.35 = 8,128.50/x
3. Step 3: Cross multiply
   10,016.88x = 13,816.35 × 8,128.50
4. Step 4: Simplify right side
   10,016.88x = 112,306,200.98
5. Step 5: Solve for x
   x = 112,306,200.98/10,016.88
6. Step 6: Final answer
   x = 11,211.69