Finding the Fourth Proportional to 8,112, 12,150.72 and 7,657.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,112 : 12,150.72 = 7,657.60 : x
2. Step 2: Convert to fraction form
   8,112/12,150.72 = 7,657.60/x
3. Step 3: Cross multiply
   8,112x = 12,150.72 × 7,657.60
4. Step 4: Simplify right side
   8,112x = 93,045,353.47
5. Step 5: Solve for x
   x = 93,045,353.47/8,112
6. Step 6: Final answer
   x = 11,470.09