Finding the Third Proportional to 385.31 and 800.63

Step by Step Solution

1. Step 1: Write the proportion equation
   385.31 : 800.63 = 800.63 : x
2. Step 2: Convert to fraction form
   385.31/800.63 = 800.63/x
3. Step 3: Cross multiply
   385.31x = 800.63 × 800.63
4. Step 4: Simplify right side
   385.31x = 641,000.39
5. Step 5: Solve for x
   x = 641,000.39/385.31
6. Step 6: Final answer
   x = 1,663.59