Finding the Fourth Proportional to 21,120.83, 31,688.28 and 7,082.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,120.83 : 31,688.28 = 7,082.25 : x
2. Step 2: Convert to fraction form
   21,120.83/31,688.28 = 7,082.25/x
3. Step 3: Cross multiply
   21,120.83x = 31,688.28 × 7,082.25
4. Step 4: Simplify right side
   21,120.83x = 224,424,321.03
5. Step 5: Solve for x
   x = 224,424,321.03/21,120.83
6. Step 6: Final answer
   x = 10,625.74