Finding the Third Proportional to 669.94 and 1,556.72

Step by Step Solution

1. Step 1: Write the proportion equation
   669.94 : 1,556.72 = 1,556.72 : x
2. Step 2: Convert to fraction form
   669.94/1,556.72 = 1,556.72/x
3. Step 3: Cross multiply
   669.94x = 1,556.72 × 1,556.72
4. Step 4: Simplify right side
   669.94x = 2,423,373.27
5. Step 5: Solve for x
   x = 2,423,373.27/669.94
6. Step 6: Final answer
   x = 3,617.31