Finding the Third Proportional to 1,258.50 and 1,915.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.50 : 1,915.50 = 1,915.50 : x
2. Step 2: Convert to fraction form
   1,258.50/1,915.50 = 1,915.50/x
3. Step 3: Cross multiply
   1,258.50x = 1,915.50 × 1,915.50
4. Step 4: Simplify right side
   1,258.50x = 3,669,140.25
5. Step 5: Solve for x
   x = 3,669,140.25/1,258.50
6. Step 6: Final answer
   x = 2,915.49