Finding the Third Proportional to 387.88 and 801.69

Step by Step Solution

1. Step 1: Write the proportion equation
   387.88 : 801.69 = 801.69 : x
2. Step 2: Convert to fraction form
   387.88/801.69 = 801.69/x
3. Step 3: Cross multiply
   387.88x = 801.69 × 801.69
4. Step 4: Simplify right side
   387.88x = 642,702.85
5. Step 5: Solve for x
   x = 642,702.85/387.88
6. Step 6: Final answer
   x = 1,656.98