Finding the Fourth Proportional to 7,128.49, 10,683.32 and 5,160.70

Step by Step Solution

1. Step 1: Write the proportion equation
   7,128.49 : 10,683.32 = 5,160.70 : x
2. Step 2: Convert to fraction form
   7,128.49/10,683.32 = 5,160.70/x
3. Step 3: Cross multiply
   7,128.49x = 10,683.32 × 5,160.70
4. Step 4: Simplify right side
   7,128.49x = 55,133,409.52
5. Step 5: Solve for x
   x = 55,133,409.52/7,128.49
6. Step 6: Final answer
   x = 7,734.23