Finding the Fourth Proportional to 21,012.84, 31,479.90 and 18,849

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.84 : 31,479.90 = 18,849 : x
2. Step 2: Convert to fraction form
   21,012.84/31,479.90 = 18,849/x
3. Step 3: Cross multiply
   21,012.84x = 31,479.90 × 18,849
4. Step 4: Simplify right side
   21,012.84x = 593,364,635.10
5. Step 5: Solve for x
   x = 593,364,635.10/21,012.84
6. Step 6: Final answer
   x = 28,238.19