Finding the Third Proportional to 1,158 and 1,780

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158 : 1,780 = 1,780 : x
2. Step 2: Convert to fraction form
   1,158/1,780 = 1,780/x
3. Step 3: Cross multiply
   1,158x = 1,780 × 1,780
4. Step 4: Simplify right side
   1,158x = 3,168,400
5. Step 5: Solve for x
   x = 3,168,400/1,158
6. Step 6: Final answer
   x = 2,736.10