Finding the Third Proportional to 18,915.89 and 30,478.57

Step by Step Solution

1. Step 1: Write the proportion equation
   18,915.89 : 30,478.57 = 30,478.57 : x
2. Step 2: Convert to fraction form
   18,915.89/30,478.57 = 30,478.57/x
3. Step 3: Cross multiply
   18,915.89x = 30,478.57 × 30,478.57
4. Step 4: Simplify right side
   18,915.89x = 928,943,248.29
5. Step 5: Solve for x
   x = 928,943,248.29/18,915.89
6. Step 6: Final answer
   x = 49,109.15