Finding the Fourth Proportional to 9,871.92, 14,814.06 and 5,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,871.92 : 14,814.06 = 5,128.56 : x
2. Step 2: Convert to fraction form
   9,871.92/14,814.06 = 5,128.56/x
3. Step 3: Cross multiply
   9,871.92x = 14,814.06 × 5,128.56
4. Step 4: Simplify right side
   9,871.92x = 75,974,795.55
5. Step 5: Solve for x
   x = 75,974,795.55/9,871.92
6. Step 6: Final answer
   x = 7,696.05