Finding the Third Proportional to 989.72 and 1,556.72

Step by Step Solution

1. Step 1: Write the proportion equation
   989.72 : 1,556.72 = 1,556.72 : x
2. Step 2: Convert to fraction form
   989.72/1,556.72 = 1,556.72/x
3. Step 3: Cross multiply
   989.72x = 1,556.72 × 1,556.72
4. Step 4: Simplify right side
   989.72x = 2,423,373.27
5. Step 5: Solve for x
   x = 2,423,373.27/989.72
6. Step 6: Final answer
   x = 2,448.55