Finding the Third Proportional to 9,915.54 and 21,317.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.54 : 21,317.55 = 21,317.55 : x
2. Step 2: Convert to fraction form
   9,915.54/21,317.55 = 21,317.55/x
3. Step 3: Cross multiply
   9,915.54x = 21,317.55 × 21,317.55
4. Step 4: Simplify right side
   9,915.54x = 454,438,137.85
5. Step 5: Solve for x
   x = 454,438,137.85/9,915.54
6. Step 6: Final answer
   x = 45,830.91