Finding the Fourth Proportional to 20,916.42, 28,865.25 and 12,416.46

Step by Step Solution

1. Step 1: Write the proportion equation
   20,916.42 : 28,865.25 = 12,416.46 : x
2. Step 2: Convert to fraction form
   20,916.42/28,865.25 = 12,416.46/x
3. Step 3: Cross multiply
   20,916.42x = 28,865.25 × 12,416.46
4. Step 4: Simplify right side
   20,916.42x = 358,404,222.02
5. Step 5: Solve for x
   x = 358,404,222.02/20,916.42
6. Step 6: Final answer
   x = 17,135.07