Finding the Fourth Proportional to 21,621.80, 29,837.51 and 12,061.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,621.80 : 29,837.51 = 12,061.98 : x
2. Step 2: Convert to fraction form
   21,621.80/29,837.51 = 12,061.98/x
3. Step 3: Cross multiply
   21,621.80x = 29,837.51 × 12,061.98
4. Step 4: Simplify right side
   21,621.80x = 359,899,448.87
5. Step 5: Solve for x
   x = 359,899,448.87/21,621.80
6. Step 6: Final answer
   x = 16,645.21