Finding the Third Proportional to 438.22 and 693.72

Step by Step Solution

1. Step 1: Write the proportion equation
   438.22 : 693.72 = 693.72 : x
2. Step 2: Convert to fraction form
   438.22/693.72 = 693.72/x
3. Step 3: Cross multiply
   438.22x = 693.72 × 693.72
4. Step 4: Simplify right side
   438.22x = 481,248.41
5. Step 5: Solve for x
   x = 481,248.41/438.22
6. Step 6: Final answer
   x = 1,098.18