Finding the Third Proportional to 1,276.59 and 1,987.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.59 : 1,987.88 = 1,987.88 : x
2. Step 2: Convert to fraction form
   1,276.59/1,987.88 = 1,987.88/x
3. Step 3: Cross multiply
   1,276.59x = 1,987.88 × 1,987.88
4. Step 4: Simplify right side
   1,276.59x = 3,951,647.02
5. Step 5: Solve for x
   x = 3,951,647.02/1,276.59
6. Step 6: Final answer
   x = 3,095.46