Finding the Fourth Proportional to 21,642.03, 29,866.38 and 12,695.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,642.03 : 29,866.38 = 12,695.98 : x
2. Step 2: Convert to fraction form
   21,642.03/29,866.38 = 12,695.98/x
3. Step 3: Cross multiply
   21,642.03x = 29,866.38 × 12,695.98
4. Step 4: Simplify right side
   21,642.03x = 379,182,963.15
5. Step 5: Solve for x
   x = 379,182,963.15/21,642.03
6. Step 6: Final answer
   x = 17,520.67