Finding the Fourth Proportional to 7,218.90, 10,832.15 and 5,124.05

Step by Step Solution

1. Step 1: Write the proportion equation
   7,218.90 : 10,832.15 = 5,124.05 : x
2. Step 2: Convert to fraction form
   7,218.90/10,832.15 = 5,124.05/x
3. Step 3: Cross multiply
   7,218.90x = 10,832.15 × 5,124.05
4. Step 4: Simplify right side
   7,218.90x = 55,504,398.43
5. Step 5: Solve for x
   x = 55,504,398.43/7,218.90
6. Step 6: Final answer
   x = 7,688.76