Finding the Third Proportional to 1,290.75 and 1,915.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.75 : 1,915.88 = 1,915.88 : x
2. Step 2: Convert to fraction form
   1,290.75/1,915.88 = 1,915.88/x
3. Step 3: Cross multiply
   1,290.75x = 1,915.88 × 1,915.88
4. Step 4: Simplify right side
   1,290.75x = 3,670,577.02
5. Step 5: Solve for x
   x = 3,670,577.02/1,290.75
6. Step 6: Final answer
   x = 2,843.76