Finding the Fourth Proportional to 21,881.10, 30,711.30 and 21,881.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,881.10 : 30,711.30 = 21,881.10 : x
2. Step 2: Convert to fraction form
   21,881.10/30,711.30 = 21,881.10/x
3. Step 3: Cross multiply
   21,881.10x = 30,711.30 × 21,881.10
4. Step 4: Simplify right side
   21,881.10x = 671,997,026.43
5. Step 5: Solve for x
   x = 671,997,026.43/21,881.10
6. Step 6: Final answer
   x = 30,711.30