Finding the Third Proportional to 12,912.75 and 30,938.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912.75 : 30,938.63 = 30,938.63 : x
2. Step 2: Convert to fraction form
   12,912.75/30,938.63 = 30,938.63/x
3. Step 3: Cross multiply
   12,912.75x = 30,938.63 × 30,938.63
4. Step 4: Simplify right side
   12,912.75x = 957,198,516.89
5. Step 5: Solve for x
   x = 957,198,516.89/12,912.75
6. Step 6: Final answer
   x = 74,128.17