Finding the Fourth Proportional to 21,093.15, 29,109.82 and 12,140.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,093.15 : 29,109.82 = 12,140.46 : x
2. Step 2: Convert to fraction form
   21,093.15/29,109.82 = 12,140.46/x
3. Step 3: Cross multiply
   21,093.15x = 29,109.82 × 12,140.46
4. Step 4: Simplify right side
   21,093.15x = 353,406,459.77
5. Step 5: Solve for x
   x = 353,406,459.77/21,093.15
6. Step 6: Final answer
   x = 16,754.56