Finding the Fourth Proportional to 10,495.32, 15,694.37 and 8,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,495.32 : 15,694.37 = 8,128.50 : x
2. Step 2: Convert to fraction form
   10,495.32/15,694.37 = 8,128.50/x
3. Step 3: Cross multiply
   10,495.32x = 15,694.37 × 8,128.50
4. Step 4: Simplify right side
   10,495.32x = 127,571,686.55
5. Step 5: Solve for x
   x = 127,571,686.55/10,495.32
6. Step 6: Final answer
   x = 12,155.10