Finding the Fourth Proportional to 21,902.10, 30,740.70 and 21,902.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,902.10 : 30,740.70 = 21,902.10 : x
2. Step 2: Convert to fraction form
   21,902.10/30,740.70 = 21,902.10/x
3. Step 3: Cross multiply
   21,902.10x = 30,740.70 × 21,902.10
4. Step 4: Simplify right side
   21,902.10x = 673,285,885.47
5. Step 5: Solve for x
   x = 673,285,885.47/21,902.10
6. Step 6: Final answer
   x = 30,740.70