Finding the Fourth Proportional to 11,680.80, 17,505.12 and 5,112.48

Step by Step Solution

1. Step 1: Write the proportion equation
   11,680.80 : 17,505.12 = 5,112.48 : x
2. Step 2: Convert to fraction form
   11,680.80/17,505.12 = 5,112.48/x
3. Step 3: Cross multiply
   11,680.80x = 17,505.12 × 5,112.48
4. Step 4: Simplify right side
   11,680.80x = 89,494,575.90
5. Step 5: Solve for x
   x = 89,494,575.90/11,680.80
6. Step 6: Final answer
   x = 7,661.68