Finding the Fourth Proportional to 21,685.17, 29,928.18 and 12,733.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,685.17 : 29,928.18 = 12,733.50 : x
2. Step 2: Convert to fraction form
   21,685.17/29,928.18 = 12,733.50/x
3. Step 3: Cross multiply
   21,685.17x = 29,928.18 × 12,733.50
4. Step 4: Simplify right side
   21,685.17x = 381,090,640.01
5. Step 5: Solve for x
   x = 381,090,640.01/21,685.17
6. Step 6: Final answer
   x = 17,573.79