Finding the Fourth Proportional to 21,111.04, 31,677.50 and 15,315.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,111.04 : 31,677.50 = 15,315.49 : x
2. Step 2: Convert to fraction form
   21,111.04/31,677.50 = 15,315.49/x
3. Step 3: Cross multiply
   21,111.04x = 31,677.50 × 15,315.49
4. Step 4: Simplify right side
   21,111.04x = 485,156,357.90
5. Step 5: Solve for x
   x = 485,156,357.90/21,111.04
6. Step 6: Final answer
   x = 22,981.17