Finding the Third Proportional to 298,215 and 443,272.50

Step by Step Solution

1. Step 1: Write the proportion equation
   298,215 : 443,272.50 = 443,272.50 : x
2. Step 2: Convert to fraction form
   298,215/443,272.50 = 443,272.50/x
3. Step 3: Cross multiply
   298,215x = 443,272.50 × 443,272.50
4. Step 4: Simplify right side
   298,215x = 196,490,509,256.25
5. Step 5: Solve for x
   x = 196,490,509,256.25/298,215
6. Step 6: Final answer
   x = 658,888.75