Finding the Fourth Proportional to 7,120.96, 10,688.76 and 5,043.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,120.96 : 10,688.76 = 5,043.31 : x
2. Step 2: Convert to fraction form
   7,120.96/10,688.76 = 5,043.31/x
3. Step 3: Cross multiply
   7,120.96x = 10,688.76 × 5,043.31
4. Step 4: Simplify right side
   7,120.96x = 53,906,730.20
5. Step 5: Solve for x
   x = 53,906,730.20/7,120.96
6. Step 6: Final answer
   x = 7,570.15