Finding the Third Proportional to 1,177.03 and 1,279.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,177.03 : 1,279.55 = 1,279.55 : x
2. Step 2: Convert to fraction form
   1,177.03/1,279.55 = 1,279.55/x
3. Step 3: Cross multiply
   1,177.03x = 1,279.55 × 1,279.55
4. Step 4: Simplify right side
   1,177.03x = 1,637,240.21
5. Step 5: Solve for x
   x = 1,637,240.21/1,177.03
6. Step 6: Final answer
   x = 1,390.99