Finding the Fourth Proportional to 21,200.67, 31,806 and 20,848.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,200.67 : 31,806 = 20,848.05 : x
2. Step 2: Convert to fraction form
   21,200.67/31,806 = 20,848.05/x
3. Step 3: Cross multiply
   21,200.67x = 31,806 × 20,848.05
4. Step 4: Simplify right side
   21,200.67x = 663,093,078.30
5. Step 5: Solve for x
   x = 663,093,078.30/21,200.67
6. Step 6: Final answer
   x = 31,276.99