Finding the Fourth Proportional to 10,672.43, 16,004.37 and 4,428.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,672.43 : 16,004.37 = 4,428.20 : x
2. Step 2: Convert to fraction form
   10,672.43/16,004.37 = 4,428.20/x
3. Step 3: Cross multiply
   10,672.43x = 16,004.37 × 4,428.20
4. Step 4: Simplify right side
   10,672.43x = 70,870,551.23
5. Step 5: Solve for x
   x = 70,870,551.23/10,672.43
6. Step 6: Final answer
   x = 6,640.53