Finding the Third Proportional to 213,793.88 and 287,965.72

Step by Step Solution

1. Step 1: Write the proportion equation
   213,793.88 : 287,965.72 = 287,965.72 : x
2. Step 2: Convert to fraction form
   213,793.88/287,965.72 = 287,965.72/x
3. Step 3: Cross multiply
   213,793.88x = 287,965.72 × 287,965.72
4. Step 4: Simplify right side
   213,793.88x = 82,924,255,175.20
5. Step 5: Solve for x
   x = 82,924,255,175.20/213,793.88
6. Step 6: Final answer
   x = 387,870.12