Finding the Fourth Proportional to 21,510.50, 29,671.62 and 13,538.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,510.50 : 29,671.62 = 13,538.89 : x
2. Step 2: Convert to fraction form
   21,510.50/29,671.62 = 13,538.89/x
3. Step 3: Cross multiply
   21,510.50x = 29,671.62 × 13,538.89
4. Step 4: Simplify right side
   21,510.50x = 401,720,650.94
5. Step 5: Solve for x
   x = 401,720,650.94/21,510.50
6. Step 6: Final answer
   x = 18,675.56