Finding the Third Proportional to 688.50 and 1,043.72

Step by Step Solution

1. Step 1: Write the proportion equation
   688.50 : 1,043.72 = 1,043.72 : x
2. Step 2: Convert to fraction form
   688.50/1,043.72 = 1,043.72/x
3. Step 3: Cross multiply
   688.50x = 1,043.72 × 1,043.72
4. Step 4: Simplify right side
   688.50x = 1,089,348.83
5. Step 5: Solve for x
   x = 1,089,348.83/688.50
6. Step 6: Final answer
   x = 1,582.21