Finding the Fourth Proportional to 21,699.15, 29,943.42 and 12,137.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,699.15 : 29,943.42 = 12,137.38 : x
2. Step 2: Convert to fraction form
   21,699.15/29,943.42 = 12,137.38/x
3. Step 3: Cross multiply
   21,699.15x = 29,943.42 × 12,137.38
4. Step 4: Simplify right side
   21,699.15x = 363,434,667.04
5. Step 5: Solve for x
   x = 363,434,667.04/21,699.15
6. Step 6: Final answer
   x = 16,748.80