Finding the Third Proportional to 1,279.55 and 2,790.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.55 : 2,790.70 = 2,790.70 : x
2. Step 2: Convert to fraction form
   1,279.55/2,790.70 = 2,790.70/x
3. Step 3: Cross multiply
   1,279.55x = 2,790.70 × 2,790.70
4. Step 4: Simplify right side
   1,279.55x = 7,788,023.93
5. Step 5: Solve for x
   x = 7,788,023.93/1,279.55
6. Step 6: Final answer
   x = 6,086.55