Finding the Fourth Proportional to 21,131.70, 29,155.52 and 12,175.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.70 : 29,155.52 = 12,175.98 : x
2. Step 2: Convert to fraction form
   21,131.70/29,155.52 = 12,175.98/x
3. Step 3: Cross multiply
   21,131.70x = 29,155.52 × 12,175.98
4. Step 4: Simplify right side
   21,131.70x = 354,997,028.41
5. Step 5: Solve for x
   x = 354,997,028.41/21,131.70
6. Step 6: Final answer
   x = 16,799.27