Finding the Fourth Proportional to 21,621.38, 29,837.53 and 12,061.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,621.38 : 29,837.53 = 12,061.88 : x
2. Step 2: Convert to fraction form
   21,621.38/29,837.53 = 12,061.88/x
3. Step 3: Cross multiply
   21,621.38x = 29,837.53 × 12,061.88
4. Step 4: Simplify right side
   21,621.38x = 359,896,638.90
5. Step 5: Solve for x
   x = 359,896,638.90/21,621.38
6. Step 6: Final answer
   x = 16,645.41