Finding the Third Proportional to 13,258.69 and 30,640.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,258.69 : 30,640.78 = 30,640.78 : x
2. Step 2: Convert to fraction form
   13,258.69/30,640.78 = 30,640.78/x
3. Step 3: Cross multiply
   13,258.69x = 30,640.78 × 30,640.78
4. Step 4: Simplify right side
   13,258.69x = 938,857,475.61
5. Step 5: Solve for x
   x = 938,857,475.61/13,258.69
6. Step 6: Final answer
   x = 70,810.74