Finding the Fourth Proportional to 7,121.69, 10,680.65 and 4,900.05

Step by Step Solution

1. Step 1: Write the proportion equation
   7,121.69 : 10,680.65 = 4,900.05 : x
2. Step 2: Convert to fraction form
   7,121.69/10,680.65 = 4,900.05/x
3. Step 3: Cross multiply
   7,121.69x = 10,680.65 × 4,900.05
4. Step 4: Simplify right side
   7,121.69x = 52,335,731.28
5. Step 5: Solve for x
   x = 52,335,731.28/7,121.69
6. Step 6: Final answer
   x = 7,348.78