Finding the Fourth Proportional to 31,328.47, 46,902.45 and 20,809

Step by Step Solution

1. Step 1: Write the proportion equation
   31,328.47 : 46,902.45 = 20,809 : x
2. Step 2: Convert to fraction form
   31,328.47/46,902.45 = 20,809/x
3. Step 3: Cross multiply
   31,328.47x = 46,902.45 × 20,809
4. Step 4: Simplify right side
   31,328.47x = 975,993,082.05
5. Step 5: Solve for x
   x = 975,993,082.05/31,328.47
6. Step 6: Final answer
   x = 31,153.55