Finding the Third Proportional to 1,279.50 and 1,988.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.50 : 1,988.63 = 1,988.63 : x
2. Step 2: Convert to fraction form
   1,279.50/1,988.63 = 1,988.63/x
3. Step 3: Cross multiply
   1,279.50x = 1,988.63 × 1,988.63
4. Step 4: Simplify right side
   1,279.50x = 3,954,629.39
5. Step 5: Solve for x
   x = 3,954,629.39/1,279.50
6. Step 6: Final answer
   x = 3,090.76