Finding the Third Proportional to 211,601 and 287,056.50

Step by Step Solution

1. Step 1: Write the proportion equation
   211,601 : 287,056.50 = 287,056.50 : x
2. Step 2: Convert to fraction form
   211,601/287,056.50 = 287,056.50/x
3. Step 3: Cross multiply
   211,601x = 287,056.50 × 287,056.50
4. Step 4: Simplify right side
   211,601x = 82,401,434,192.25
5. Step 5: Solve for x
   x = 82,401,434,192.25/211,601
6. Step 6: Final answer
   x = 389,418.93