Finding the Fourth Proportional to 21,685.96, 29,926.83 and 12,733.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,685.96 : 29,926.83 = 12,733.61 : x
2. Step 2: Convert to fraction form
   21,685.96/29,926.83 = 12,733.61/x
3. Step 3: Cross multiply
   21,685.96x = 29,926.83 × 12,733.61
4. Step 4: Simplify right side
   21,685.96x = 381,076,432.12
5. Step 5: Solve for x
   x = 381,076,432.12/21,685.96
6. Step 6: Final answer
   x = 17,572.50